952A is a bally model number for an EM slot, but that machine has a double progressive jackpot in the top.
I'd guess your game is a conversion to something that behaves like a model 1090 ... a 3 coin multiplier with left<->right pay.
your top compartment is way bigger than needed for a simple 3 coin multiplier, so bally didn't make it that way.
if you don't have any circuit boards in the game, you'll want to switch to the "Bally Electromechanical" area and post there. More pics would be great, especially what's in the top compartment (both the lamp side and the stuff behind the lamp panel), as well as the left side of the reel mech.
assuming it is a bally em, when a coin is accepted the coin relay on the bottom/rear of the reel mech will trip. That will in turn trip the handle release relay.