Longines, Swiss, No. 5789292, circa 1935. Fine aircraft board chronometer with split seconds chronograph, 36 hour power reserve indication and special device with revolving dise to set time within a fraction of second. | Important Collectors Wristwatches Pocket Watches & Clocks | Geneva, Hotel Des Bergues, 22nd April 1995

Important Collectors Wristwatches Po...

Geneva, Hotel Des Bergues, Apr 22, 1995

LOT 15

Longines, Swiss, No. 5789292, circa 1935. Fine aircraft board chronometer with split seconds chronograph, 36 hour power reserve indication and special device with revolving dise to set time within a fraction of second.

CHF 4,800 - 5,200

USD 4,000 - 4,500

Sold: CHF 6,325

C. Duralumin with reeded bezel, crewed in a double body mahogany box with hinged lid. D. Mat silvered with Arabic numerals, outer revolving chronograph ring and inner up-anddown sector. Blued steel hands. M. 19"', 2129 calibre, rhodium plated, "fausses côtes" decoration, 26 jewels, straight fine lever escapement, mono-metallic balance, self compensating Breguet balance spring with special micrometric index. Split seconds chronograph with visible work, buttons on the bezel border. Signed on the box, dial and movement. h1 very god condition. Dial diam. 70 mm. Box dim. 16x14x6cm.

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The split second's hand las to be stopped at the hour signal; the revolving chronograph ring must be turned in order to set the division "60" facing the split second's band which is then released to join the other chronograph hand. The chronometer is therefore set to time within a fraction of second. This type of board chronometer is described and illustrated by Samuel Guye in L'Horlogerie - Une Tradition Helvétique, 1948, chapter: Les montres de bord pour automobiles et avions, pages 202-