5,900 CHF
Deck Chronometer A. Lange & Söhne, Glashütte/Sa., No. 200336, issue No. M4469. Made circa 1942. Fine, keyless, silver, deck and pocket lever chronometer with power reserve indication and Guillaume balance. Four-body, bassine, polished, back cover engraved with the watch issue number. Hinged silver steel cuvette. Brushed silvered with painted black Arabic numerals, outer minute track, large subsidiary seconds at 3, power reserve indication at 9. Blued steel spade hands. Notes This model of deck watch was made for the Kriegsmarine Observation Service. Guillaume Balance In 1899, Dr. Charles Edouard Guillaume noticed that steel with an addition of 44.4% nickel had a negative square coefficient of thermal expansion. This alloy, combined with brass in bimetallic lamina, makes its expansion close to quadratic. Balances with bimetallic rims made of anibal (anibal, an alloy invented by Guillaume, stands for (Acier au NIckel pour BaLanciers) and brass are usually called Guillaume balances, or, as their inventor called them, integral balances. When combined with special balance springs, they exhibit remarkable temperature stability, on occasion not exceeding 1/50 second per day at 1ºC.
Auctioneer:
Antiquorum
Date:
2007-11-11
