Oh yeah, I had forgotten I made that picture ID guide years ago over at the KLOV forums.
Basically, before 1982 or 1983, all pinball machine manufacturers made their own coin doors. It's what helped identify who made the machine was by simply looking at the coin door! After 1983, the machine manufacturers decided to outsource coin doors from manufacturers who specifically made coin doors. Here are the big manufacturers of coin doors at the time:
Coin Acceptors, Inc. (a.k.a. "CoinCo" )
Coin Controls (originally made in England and 100% all metric)
Coin Mechanisms, Inc. (a.k.a. "Coin Mech" )
Happ Controls (now known as SuzoHapp)
Over the years many things happened to all those door manufacturers:
Coin Acceptors, Inc bailed out completely from the amusement coin door/coin acceptor market around 1998 and now only support vending machine coin/bill handling equipment. If you ask them about any of the amusement coin door stuff, they'll say "Did we make that? Sorry no information or support".
Coin Controls got bought by Wells-Gardner (the video monitor maker for arcade and gambling machines) and had manufacturing moved to the USA and some parts retooled to American threads/standards. Then Happ Controls bought them out and started discontinuing some of the parts.
Coin Mechanisms, Inc is still around and doing quite well with their line of coin doors and mechanical & electronic coin acceptors. Only drawback today with them is that parts that were formerly chrome plated is now unplated steel. However, they still are great products.
Happ Controls merged with the European amusement/gaming/vending parts distributor Suzo Trading Company to become SuzoHapp. Then they started buying out just about every manufacturer in the amusement and gaming industries. This resulted in many company's parts being discontinued or had prices jacked up sky high by SuzoHapp. Happ's own line of coin doors got cheapened with softer grades of metals and tons more of formerly metal parts be replaced with plastic counterparts.
For those of you who need manuals/parts listing of the above coin doors, simply visit here: