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205-4263 Pocket watch: absolute rarity, the only known piece of the Strömgren og Olsen "sidereal time/mean time" deck watch with gold case, No.0557, ca. 1918
Ca. Ø60mm, ca. 188g, 18K gold, Ankerchronometer movement calibre Alex Hüning Geneva, large bimetallic chronometer balance, swan-neck fine regulation, splitted barrel bridge, wolf's toothing, separate plate for the sidereal time, signed and numbered enamel dial showing the mean solar time and the sidereal time, subsidiary seconds, in excellent condition, in working order. To date, only a few examples with silver cases are known, and only this one example here in gold. The gold case is matching the known silver cases in all technical details. A detailed report on these watches can be found in Klassik-Uhren 1/1995. These watches rarely appear at auction. Number 0541 achieved a record result of almost 50,000 Swiss Francs in Geneva (https://www.cortrie.de/go/mPQ). The exceptional watchmakers Elis Strömgren Svante and Jens Olsen received the Danish patent with the number 22822 on 11 February 1918 for their invention. They commissioned the manufacture of the watches from the Geneva chronometer manufactory Alexander Hüning, and Hüning's manufactory punch ("FH or AH") can be found on some of the watches. On some watches there are also the movement numbers under the dial or on the case, most with 54900' numbers, made ca. 1914-1918. A sidereal day is the length of time it takes the earth to make one complete revolution around its axis. Compared to the commonly used solar time, which is based on the revolution of the earth by the sun, the sidereal day is almost four minutes shorter than the solar day. The watch comes with a copy of the original instruction manual by Cornelius Knudsen, Royal Court Instrument Maker, Nautical Department Copenhagen!
Limit: 20.000 €
Estimate: 50.000 €