Well, my Popmatic has arrived. It was made in 1936 according to the tag.
It appears complete. The clockwork mech needs a clock spring, but it will work.
Coin mech works fine and all moving parts seem to move as they should.
I can't figure out what turned on the light and the heater. Someone wired them to switch on with a toggle switch. If anyone knows how they were originally switched on, please let me know.
Pics here:
http://1937popmatic.blogspot.com