The Internet Pinball Serial Number Database or IPSND collects serial numbers of pinball machines and publishes a database of these on the Internet. Our goal is to make available a registration of all pinball machines in existence and allow tools for slicing, dicing and visualization of the data.

Games: 6,703  Serials: 70,534  Visitors: 81,535,068  Members: 5,788  Photos: 45,945  Lat/Lng: 39,204  Masks: 70,534(1,052.28%)  Traits: 578  Nudges: 232,981  Backglasses: 1,865
  Most Serials: Twilight Zone(1,351)  Most Submissions: Dennis Braun(6,157)  Most Points: Dennis Braun(45,844)  Highest Quality: The Knight(17.00)  Most Nudges: pinballservice-nl(29,869)
Judge Dredd - IPSND/IPDB No. 1322 - September 1993
Backglass Image
Manufacturer: Midway Mfg. Co., a subsidiary of WMS Industries, Inc.
Players: 4
MPU: Williams WPC (DCS)
Production Run: 6,990
Game Type: Solid State Electronic (SS)
Model: 20020
Submissions: 405 serials of 6,990 (5.79%)
Coverage help:

Coverage is a mathematical interpretation of the serial numbers that have been submitted so far. The term 'coverage' relates to the amount of the production run that has been 'covered' in the given submissions.

There are two coverage methods shown, each has a different approach of calculating an guess on the number of games produced by analysing the currently submitted serial numbers.

Linear: Linear coverage simply looks at the highest serial number and subtracts from it the smallest serial number to estimate the number of games produced. For some games, this works fine because the serial numbers were sequential and without gaps (Early Bally, Early Stern, etc). However, this approach starts to fail quickly for games that serial numbers are part of a bigger numbering scheme (Williams pre 1984, Current Stern) or that intentially had gaps/skips in the numbering sequence(Gottlieb post 1960). If you see a linear coverage number that is higher than the known production run, it is probably not the best way to look at the serial range and you should look at the clustered approach below.

Clustered: Clustered coverage assumes that there are gaps/skips in the serial sequence for a game. It groups the serial numbers together based upon how close they are to the next serial number in the sequence. If they fall within a certain threshold then the SerialBot assumes that there are valid serial numbers between the two. If they are far enough apart, then the SerialBot assumes this is a gap. Once all the gaps and groups are determined, it sums up all the linear ranges in each group. This way, if a sample run of games started at 15,000-15,100 and the production games started at 17,000 onwards, it would assume that the serial numbers between 15,100-17,000 were a gap an are not counted. Using this method, as more serial numbers are submitted the gap analysis will get more accurate.

752,071 (10,759.24%) linear / 27,365(391.49%) in 125 clusters 349 wide.
Cluster Serial Number SerialBot Submitted By Country Game Part

Submit a new Game Trait

The following traits help

Game Traits are properties for an individual game that you would like to see tracked along with the other information gathered for a serial number submission. Some examples of existing traits are... Joust: Black or Blue bottom Arch, Black Knight: Faceted Inserts or Normal Inserts, Twilight Zone: 3rd Magnet Installed or not.

have been submitted for this game...

Field NameDescriptonSubmitted BySubmit DateSubmitted
Eagle Topper Present? Is the game complete with the plastic golden eagle topper that sits on top of the backbox? Large comparison image here - http://i.imgur.com/3Hs0fNK.jpg(Valid Values: Yes - Original,Yes - Reproduction,Yes - Unknown Origin,Broken,No)
Gary Woodhouse2/1/201685

Cluster Serial Number Country

This section lists any known game part serials that happen to match this game's serial mask (if defined). What this can tell you is if a game has any orphaned parts that might exist in other machines. This generally applies to CPU/MPU boards, Driver Boards, Display boards etc that are easily moved from game to game. Repair shops and distributors often robbed parts from other 'scrap' games laying around in a pinch if they were not able to fix the original part or of the original part was damaged beyond repair. If serials start showing up in the database as 'game parts', there is potentially a good chance that that game has been parted out completely, which is unfortunate. It is becoming more and more common for people to part out games and sell them on ebay simply because the seller can often make more money that way.... Please do not sacrifice complete games for money!!!

SerialBotSerial NumberTypeSubmitted ByCountryDetails
76504 20220092652 Solenoid Driver Alexander Visotin Australia flag Australia
78041 20220153252 Display/Driver Alexander Visotin Australia flag Australia
77384 20220163262 Display/Driver Alexander Visotin Australia flag Australia
50213 20220196792 Display/Driver Fun House Germany flag Germany
64148 20220197762 Display/Driver Fun House Italy flag Italy
28493 20220214232 Flipper Board John Vorwerk United States flag United States
59335 20220214562 Display/Driver Fun House Netherlands flag Netherlands
49237 20220220072 MPU/CPU Dennis Braun United States flag United States
68230 20420256492 MPU/CPU Fun House Croatia flag Croatia
77945 20620232742 Solenoid Driver Alexander Visotin Australia flag Australia
77944 20620277242 MPU/CPU Alexander Visotin Australia flag Australia
72554 20620277442 Display/Driver Alexander Visotin Australia flag Australia
72687 20620277722 Solenoid Driver Alexander Visotin Australia flag Australia
56517 20720161092 Display/Driver Fun House United States flag United States
80668 20720214182 MPU/CPU strobey United Kingdom flag United Kingdom
64465 20720214182 Coin Door Clive Pedersen United Kingdom flag United Kingdom
48829 21020095612 Sound Board Rod McLarge United States flag United States
58900 21020099772 Display/Driver Fun House United States flag United States
37966 21020163292 Sound Board Rod McLarge United States flag United States
71292 21020164062 MPU/CPU Clive Pedersen United Kingdom flag United Kingdom
45944 21020164462 Flipper Board Antti Peltonen Finland flag Finland
68860 21020170192 MPU/CPU Dennis Braun United States flag United States
58634 21020174822 Flipper Board Dennis Braun United States flag United States
48944 21020220612 Display/Driver Fun House Korea, Democratic People's Republic of flag Korea, Democratic People's Republic of
65965 21020248402 Display/Driver Clive Pedersen United Kingdom flag United Kingdom
68138 21020249682 MPU/CPU Clive Pedersen United Kingdom flag United Kingdom
41340 21020251592 Flipper Board Rod McLarge United States flag United States
68581 21020280922 Other/Unknown Clive Pedersen United Kingdom flag United Kingdom
59626 21320166532 Display/Driver Fun House Italy flag Italy
54625 21320194172 Display/Driver Fun House Korea, Democratic People's Republic of flag Korea, Democratic People's Republic of
54569 21320194172 Flipper Board Dennis Braun United States flag United States
57188 21320195802 Display/Driver Fun House Netherlands flag Netherlands
33034 21320235822 Power Supply Rod McLarge United States flag United States
61047 21420096632 Display/Driver Fun House France flag France
80055 21420097892 Solenoid Driver Dennis Braun United States flag United States
59566 21420166472 Flipper Board Fun House Italy flag Italy
52920 21420195482 MPU/CPU Antti Peltonen Finland flag Finland
54799 21420226362 Flipper Board Dennis Braun United States flag United States
29519 21420234692 MPU/CPU Ric Turner United States flag United States
74831 21420252812 MPU/CPU Fun House United States flag United States
59634 21420252982 MPU/CPU Fun House Italy flag Italy
77705 21420253082 Solenoid Driver Alexander Visotin Australia flag Australia
67818 21420253082 Flipper Board Fun House Italy flag Italy
63780 21520248172 Flipper Board davefinn United States flag United States
34930 22020218802 MPU/CPU John Vorwerk United States flag United States
64995 22120253072 Display/Driver Fun House Germany flag Germany
16350 22120264512 Power Supply Marcus Lindahl Sweden flag Sweden
76533 22220217802 Display/Driver Fun House Italy flag Italy
54824 22320247902 MPU/CPU Dennis Braun United States flag United States
59555 22520229632 Flipper Board Fun House Italy flag Italy
64749 22520241462 Display/Driver Fun House Italy flag Italy
61640 22520272922 Display/Driver Dennis Braun United States flag United States
58100 22720221691 Display/Driver Fun House United States flag United States
80669 23320217982 Solenoid Driver strobey United Kingdom flag United Kingdom
62224 23320218122 MPU/CPU Fun House Poland flag Poland
50107 23320234372 Display/Driver Fun House United States flag United States
71137 23320249622 MPU/CPU Dennis Braun United States flag United States
35690 23320253382 Flipper Board Rod McLarge United States flag United States
48009 23320260502 Display/Driver Rod McLarge United States flag United States
63135 23320270512 Coin Door Dennis Braun United States flag United States
18148 23320276522 Display/Driver John Vorwerk United States flag United States
52238 23320292512 Display/Driver Rod McLarge United States flag United States
28980 23320292732 Other/Unknown Seal Clubber United States flag United States
53264 23320293792 MPU/CPU Dennis Braun United States flag United States
78897 23320294712 MPU/CPU Clive Pedersen New Zealand flag New Zealand
59170 23320294992 Display/Driver Fun House United States flag United States
72727 23320295022 MPU/CPU Charles P United States flag United States
49357 23320298862 MPU/CPU Dennis Braun United States flag United States
66680 23320299222 Display/Driver Fun House United States flag United States
30736 23320299402 Flipper Board John Vorwerk United States flag United States
58057 23320348262 MPU/CPU Fun House United States flag United States
47330 23320390062 Display/Driver Rod McLarge United States flag United States
63772 23320390252 Solenoid Driver Dennis Braun United States flag United States
32166 23320392132 Display/Driver Rod McLarge United States flag United States
32594 23320392172 MPU/CPU Rod McLarge Canada flag Canada
51022 23320394482 Display/Driver Dennis Braun United States flag United States
26845 23320396992 Sound Board Antti Peltonen Finland flag Finland
25502 23320398782 Display/Driver John Vorwerk United States flag United States
11594 23320398982 Other/Unknown Dan Gutchess United States flag United States
23323 23320441812 Flipper Board John Vorwerk United States flag United States
32908 23320445432 Power Supply Rod McLarge United States flag United States
26282 23320445692 Solenoid Driver John Vorwerk United States flag United States
79105 23320445812 Flipper Board Fun House Italy flag Italy
25440 23320455692 Sound Board John Vorwerk United States flag United States
41403 23320491212 Coin Door MIGUEL ANGEL Spain flag Spain
41402 23320491212 Coin Door MIGUEL ANGEL Spain flag Spain

This section lists any known information about how to physically find serial numbers on games created by this manufacturer. For all manufacturer tips, please visit the Serial Tips Page . (Please do not post serial numbers here on this form.)

Posted 6/29/2007 12:22:32 PM by Jess Askey
On Bally games from this era, there are serial number stickers everywhere. There should be one on the front of the cabinet under the coin door, one on the back of the cabinet on the model sticker and I believe there is one on the top of the backbox as well (this is a good one to look at if the others are damaged). Also, all the game printed circuit boards have the original serial number on them as well.
Posted 11/30/2008 10:30:39 AM by Steve fisher
also look on the power pack
Members can submit new tips on how to find serial numbers! Sign up for a free membership here!

This game has the following serial number formats defined in the database. As serial numbers are sumbitted, trends are recognized and defined or information about a serial number format is collected through historical information.

TypeExamplesRegExMaskLowerLimitUpperLimitAutoAssignable
Production Game 23320342692, 23320295012, 22720083582 ^(2[0-9][0-9]20)(?<sortdata>[0-9][0-9][0-9][0-9][0-9][0-9])$ True
International Game 23320I753432, 23320I725728, 23320I445452 ^(2[0-9][0-9]20)(I)(?<sortdata>[0-9][0-9][0-9][0-9][0-9][0-9])$ True
Experimental Game 23320X753432, 23320X725728, 23320X445452 ^(2[0-9][0-9]20)(X)(?<sortdata>[0-9][0-9][0-9][0-9][0-9][0-9])$ True


The Serial Bot Summary information here gives a detailed explanation of the Serial Bot analysis for this specific game. The theory behind the Serial Bot is this...

Every game has many many serial number submissions, the goal of the IPSND is not to guarantee that *all* information is 100% correct but that over time, the system should automatically devalue inaccurate submissions while increasing the value of correct submissions.

You may click on the SerialBot score of any submission to see how it was calculated.

SerialBot Color Codes:
- Not Validated The serial number submission has not yet been validated by the submitter via email.
- Unknown There is no known information on the serial number format for this game yet. As more submissions are received we can start to make a best guess on the serial number format.
- Good If a serial does not fail any of the tests for a status of Warning or Bad, then it is good.
- Suspect A serial will have a suspect status if the format is technically correct but there is something wrong with the data. Examples might be that the number might be too high or low for the known range of serials for this game.
- Bad If a game has a serial number definition mask defined for it, then a serial may be marked as 'bad' if the number does not validate agains the mask. Masks are created for games by looking at known serial number formats and consist of a regular expression to define the format of a game serial.

SerialBot Scores:
1 Point Awarded if the serial number has a game assigned to it. This autoatically makes submissions with a known game more valuable than submissions without a known game.
1 Point Awarded if the serial number has been 'verified' by the submitter. A submission is 'verifed' if the submitter clicks on the link in the email sent to them for each submission. The basis for this rule is that submissions by people that do not take the time to respond to the email might be entering garbage data and/or giving fake email addresses. However, it is common for 'verification' emails to get stuck in spam filters etc, so, members may have 'verification' emails re-sent at any time.
1 Point Awarded if the submitted serial number matches one of the predefined serial number masks for this game.
1 Point Awarded if the serial number was marked as 'Physically Viewed' during the submission process. This is an interesting distinction as there are many times that serial numbers are submitted off owners lists, Ebay auction, etc. While these serial numbers are valuable, they may also be innacurate. In comparison, Physically Viewed serial number submissions are numbers that the submitter has actually been in front of the machine reading the number and then submitting it. Since it is more likely to get a good visual from a physically viewed machine, this gains an extra point.
1 Point If a photo is uploaded with the serial number submission. The submission automatically gains an additional point. Be aware however that this opens the submission up to 'Nudges' by members where even more points can be added or subtracted based upon the quality and accuracy of the photo.
-3 to +3 Points Members can 'Nudge' every sumitted photo once and give it an extra boost of 1 point or take away 1 point depending if the photo matches the submitted serial number. While any number of members may nudge a serial, the nudging can only affect the score by +/- 3 points in either direction.

The following map shows the locations of all serial numbers that were submitted with a geolocation...