Chistopol watch factory "Vostok", "Komandirskie" watches with a 24-hour blue dial on the movement 2431, design code 650547 22. In other variations 650541, 650546 1 and 650547 1. Such watches are popularly known as: shift, polar, daily ( diaries). This type of mechanism has been used by cosmonauts, submariners, pilots and polar explorers. It made it possible to determine the daily time where it was impossible to visually determine the day or night. The video tells about the history of this watch, technical characteristics and general feel.
Watch with aliexpress, if interested, ask in the comments, I will throw off the link.


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