A model 134M Russian Air Force two-day lever chronometer with electrical contacts First Moscow watch factory, No. 2048, 1960's, the frosted silvered dial signed (in Russian) First Moscow Watch Factory Named after Khirov, Arabic hour numerals, yellow metal hour and minute hands, subsidiary seconds and up-and-down dials with blued steel hands, gold plated frame with parallel lined spotting, the barrel bridge inscribed with the factory stamp and numbered N2048, 18,000 count train, integral cut bi-metallic balance with four cylindrical heat compensation weights, steel helical balance spring, lever escapement with jewelled impulse roller, the lever with jewlled entry and exit pallets, mounted on the fourth wheel arbour a wheel forming part of the electric contacts assembly with sixty teeth (one for each second) and which operates a pivoted detent with jewelled locking pallet the outer end of which has electrical make/break contacts, in brass bowl suspended by four springs within the gimbal ring, three tier brass bound oak box, the base of the bottom section with electrical heating element and the outside with two toggle switches controlling the electrics, applied metal plaque of the First Moscow Watch Factory, numbered 2048 four hinged metal units on the bottom for securing the chronometer inside the aircraft; with a painted metal instrument displaying three minute recording dials with various operating switches, applied plaque inscribed M134 with rating certificate (in Russian) dated 1970 -- 93mm dial diam, 190mm sq box See illustration

Details
A model 134M Russian Air Force two-day lever chronometer with electrical contacts First Moscow watch factory, No. 2048, 1960's, the frosted silvered dial signed (in Russian) First Moscow Watch Factory Named after Khirov, Arabic hour numerals, yellow metal hour and minute hands, subsidiary seconds and up-and-down dials with blued steel hands, gold plated frame with parallel lined spotting, the barrel bridge inscribed with the factory stamp and numbered N2048, 18,000 count train, integral cut bi-metallic balance with four cylindrical heat compensation weights, steel helical balance spring, lever escapement with jewelled impulse roller, the lever with jewlled entry and exit pallets, mounted on the fourth wheel arbour a wheel forming part of the electric contacts assembly with sixty teeth (one for each second) and which operates a pivoted detent with jewelled locking pallet the outer end of which has electrical make/break contacts, in brass bowl suspended by four springs within the gimbal ring, three tier brass bound oak box, the base of the bottom section with electrical heating element and the outside with two toggle switches controlling the electrics, applied metal plaque of the First Moscow Watch Factory, numbered 2048 four hinged metal units on the bottom for securing the chronometer inside the aircraft; with a painted metal instrument displaying three minute recording dials with various operating switches, applied plaque inscribed M134 with rating certificate (in Russian) dated 1970 -- 93mm dial diam, 190mm sq box
See illustration

Lot Essay

The 134M chronometer was manufactured in the 1960's specifically for use in long-range aircraft of the Russian Airforce. These aircraft could remain airbourne for up to thirty hours including a re-fuelling schedule. As they could refuel in flight it was essential that their geographical position be known accurately. Their crews did this by astro-navigation, using a sextant and a chronometer. The 134M chronometer was designed for a maximum flying altitude of 20,000 metres and the built-in heating element is thermostatically controlled to switch on when the temperature goes below 20° Centigrade

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