Not positive, but looks kind of like the part that holds the coin mechanism in place. See the following image (note: the coin mechs aren't installed in this example).

http://remote.kiwi.gen.nz/JP2/jpCoinDoor.jpg

It looks to me like a bracket to secure the coin mech. The oval holes are clearance holes for the adjusting screws in the removable con mechs. Attached is a picture I found of something similar. Coin doors and mechs are purchased parts, and so could change a lot over the years with little documentation by the pin makers.

Don C.

Internal-view-of-Coin-Controls-DBV-Door.jpg

Good call Don C

PBR has another angle picture of Williams coin door and as Don C says it looks like it's used to hold the coin mechs.

image.jpg

Yes... its the hold-down for the mechs in newer coindoors. (keep it... some day you'll need it)

It does not belong to an Aztec.
Williams 1970's (early '80's) mechs had a bracket you mount to the coin mech itself, and gets held in place by a spring-clip on the door frame piece.

Here's what the mounted bracket looks like:

tmp_will_coin-1141699055.jpg