Here is an unfortunately common failure in the Spotmatic family: the meter does not work. A quick test shows that the galvanometer is burned out.
No more galvanometer in my stock, I bought on ebay two more Spotmatics for parts ...
Here is a functional galvanometer ready for installation.
The new galvanometer in place. I tested the setting in comparison with other cameras of the same family: perfect!
Another concern is that the battery compartment is missing. I have another bottom cover (on top)...
... But it is very ugly. And no soles on the bodies I bought for parts! I will have to unset my battery compartment and bond it in the original base.
Body finished and ready to go back to it's owner.