Delturner- My guess is closer to 1963-65 since it has a round window. The machine in my sister's apartment building (referenced above) appeared to be several years old when she moved there in '67. As you mentioned, the controls were on a very plain console; just a toggle switch for hot or warm water and a PUSH reset button in case the internal fuse blew.
At any rate, 2 dimes bought 20 minutes of delightful entertainment, LOL. The view into the machine was even better when I put a cap on the agitator---no water splashing up onto the window.
Question For Robert (or anyone else who might know): Does the Super Duty Multi-Matic coin-op machine in the photo above (Reply #9) pause between pulsating and spins? I always assumed the one I used was a Unimatic because it didn't pause. Maybe I am wrong; maybe it was a Multi-Matic, as well.