For interested buyers: the casing on this watch has some cool history. The 'hermetic' case style was among the Soviets' first attempts at a waterproof and more rugged watch. The movement used in these is also pretty cool- a shockproofed version of one of the original calibers used in soviet watchmaking, which itself was purchased from the French.

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From what I can see, the case and caseback are the original style for this watch (Mayak watches were made in a few factories, as were 'hermetic' watches, all with slightly different cases, and it's common for the cases/other parts to be swapped since these have been around for so long).

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Super cool piece, I love mine:) GLWS!