Rare Soviet First Moscow Watch Factory 13ЧП Aviation Astrono...

Rare Soviet First Moscow Watch Factory 13ЧП Aviation Astronomical two-day chronometer, No. 2624 complete with its electrically heated and spring shock-mounted box, the 4.25" silvered Arabic dial with 56-hour up/down indicator over constant seconds, the fusee movement with split compensated balance, helical hairspring and anchor escapement in brass casing, the square case 7.5" wide, 7" high ** The 13ЧП is an aviation astronomical chronometer, intended to provide an accurate time reference for celestial navigation aboard aircraft and for use in conjunction with an aircraft sextant ** Unlike the traditional detent escapement normally associated with a marine chronometer, the 13ЧП uses a lever (anchor) escapement, better suited to the vibration and movement encountered aboard an aircraft ** From the David Read Collection

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