You're not sure? Did someone paint over the name?

What stepper is it? and do the score reels reset?

Great resource to bookmark: http://www.pinrepair.com/em/index1

I can't tell from the pic if all the wires are securely on this moving arm, esp. between the two at the top of the pic.

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Z1 and Z2 do score resets, but yours are already on 0. The rivets on that player unit look they could use a cleaning. Do the little 'snowshoes' on the arm move easily and snap back if pulled?

It may well be that AX and BX need adjustment. Pull the cotter pins that hold them (carefully, so they don't fall under the bottom board) and have a close look as you manually operate the plastic armature. Both have make/breaks that need to be adjusted just right.