Yeah, that's a blank door that was customized. I don't recognize the parts that remain, so who knows.

For early WPC games, they used Coin Controls doors.

Typically, I've seen the 3-slot variant like this, but with the appropriate coinage labels:

pasted_image (resized).png

The US door was the same, but just had 2 coin slots, rather than 3:

pasted_image (resized).png

I've seen this style of coin door on a couple WPC games, though I'm not entirely certain that it's era appropriate. It's also a Coin Controls door, but it seems like it might actually be for Data East games that were possibly converted for use for WPC games by swapping the coin door's harness.

pasted_image (resized).pngpasted_image (resized).png

Pinball machines can bounce around a bit as they are bought and sold. It's possible that they could have been owned by the same operator at some point.