Horological Meandering

It took several months of negotiating, but I now own the rarest of Soviet military chronometers. It is a completely new and unused 13-20YM Air Force Chronometer with ALL the installation components. Made in 1973, it is so pristine that it came to me still...  

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Because the seals on the 'new' chronometer are intact, I cannot open it to photograph the movement. However, I have 2 other examples of the same exact model, so I have shot the movement of one of these (collection No. 0256). Please be cautioned that this ...  

In the last shot, there is a small wheel perpendicular to the plates. What does it do? A

Great Mark, Fusee and chain, conical hairspring, lovely functional finish but still aesthetically beautiful. Thanks again for sharing this piece and the winding procedure below. A whole other area of horology I know little about and I am getting that ‘tin... 

To wind this clock, the navigator unlocked the brass retaining ring and pivoted the bowl so the bottom faced up. He then took the winding key, which is stored in a slot in the upper right hand corner of the box, and inserted it in the hole in the bottom o...