Quoted from uncivil_engineer:I have never seen a coin door like that one. Thanks for pointing that out.
They're reasonably common on Gottlieb games--quite a few are re-imports have them, especially the rare/popular titles. It's hard to find US style doors, so they don't usually get swapped out.
You don't see the one slot style too much on WPC games in the US. A lot of times, WPC games just used the same US style door and just swapped out the coin plates, or a foreign door had already been swapped out with a US door, since they weren't too hard to obtain.
