Omega "Chronometre a Tourbillon", Movement No. 10595941, Cal. 30 I, 39 mm, circa 1974
A gentleman‘s important and extremely rare wristwatch - chronometer with 7 1/2 minute tourbillon; the first wristwatch caliber with tourbillon and one of only twelve pieces of this tourbillon model Case: 18k gold, tiered band, glazed push back, 18k gold deployant clasp. Dial: gilt, engine-turned, applied silver chapter ring with inlaid radial Roman numerals, auxiliary seconds, blued Breguet hands. Movm.: 2/3 plate movement, rhodium-plated, "fausses côtes" decoration, fine ground steel tourbillon cage, Guillaume screw compensation balance.
Cal. 30 I "As the caliber was developed solely for precision testing at observatory competitions, Jean Pierre Matthey-Claudet created only 12 copies according to the design by Marcel Vuilleumier, director of the watchmaking school in Valée de Joux. The famous Alfred Jaccard fine-adjusted some of these movements between 1947 and 1952 and they achieved outstanding results in Kew-Teddington, Neuchâtel and Geneva." Source: Marco Richon "Omega" Bienne 2007, p. 190 et seqq.
Estimate 55,000 - 65,000 €
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