Interesting Leica M for sale...

Nice! That is a genuine Dutch Post camera in correct serial range. Note the bar on the advance and the bosses on the face for the shroud. The most interesting piece is the modified Summicron, again correct.
 
When the body was mounted to the shroud, the bar aligned with a spring-loaded detent on the attachment plate. When the film was advanced the bar would slide across the detent. I never used one in anger and will recuse to a postal worker, but I believe the detent cycled the charge for the flash. Regardless, it plays a purely static role on the body itself.
 
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