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SILVER OBSERVATORY “TOURBILLON” Omega, Usine de Geneve "Tourbillon", No. 10595936, Cal. 30 I
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À propos de l'objet

SILVER OBSERVATORY “TOURBILLON”\n\nOmega, Usine de Geneve "Tourbillon", No. 10595936, Cal. 30 I. The 4th of 12 movements made in 1947, then entered in the 1948 Geneva Observatory trials, where it scored 806 points and again in 1952, where it scored 735 points. One of seven movements cased and sold in 1987. Extremely rare and very important, sterling silver gentleman's wrist chronometer with a 7 1/2 minute Tourbillon regulator. This watch is sold with a box, Certificate of Authenticity and 2-year Omega guarantee. \n\nC. Three-body, solid, polished, transparent back, lapidated bezel, concave lugs on the band at 4 o'clock a push-button for hand-setting. D. Matte silver with painted black Dauphine numerals, outer minute divisions and subsidiary seconds dial. Blued steel “baton” hands. M. Cal. 30.I.1947, 2/3 plate, maillechort, 25 jewels, 7.5 minute "tourbillon" regulator, two-part rhodium plated brass cage held by three case-screws, Guillaume balance, Breguet overcoil, 18,000 vibration/hour, index regulator on one of the cage's arms, Dial and movement signed. Diam. 36 mm. Thickness 11.5mm.\nProperty of a Swiss Lady
CH
CH
CH

notes

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.

condition

Case

2 in perfect condition

Dial

2 in perfect condition

HANDS 01 original

Movement

2 in perfect condition

Experts' Overall Opinion

exceptional


*Merci de noter que le prix n'est pas recalculé à la valeur actuelle, mais se rapporte au prix final réel au moment où l'objet a été vendu.

*Merci de noter que le prix n'est pas recalculé à la valeur actuelle, mais se rapporte au prix final réel au moment où l'objet a été vendu.


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