Re: What is it - Enigma related??
Excellent summary David.
To answer a few of your points.
The lockable twin screws do indeed permit the body to be rotated slightly to synchonise the contacts between switches.
The plastic cover only comes off if the switch is removed from the panel, it has a lip preventing it coming forward.
I opened the single switch and post some more photos below.
The contacts are numbered 1 to 16 on the inside.
The 45 degree gear wheel has 18 teeth and it is very easy to assemble misaligned, I found a faint red mark on the body which indicates where the metal adjusting pawl should go. When I reassembled it to the mark it now aligns with the other switches.
There are no marks or model numbers inside other than the 1-16 mentioned.
While the switch contacts are all individual, it has been wired as a 16 way switch with a single common contact.
Peter
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