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Important Modern & Vintage Timepieces.

Geneva, Mar 21, 2020

LOT 6

JULES AURICOSTE, SIDEREAL COUNTER, MAHOGANY AND BRASS

Fine and rare mahogany and brass, three-body, rectangular deck-watch type box, key-winding with a 2-day sidereal counter. This type of instrument was used by astronomers and navigators for their observations.

Brand Jules Auricoste, "Horloger de la Marine", Paris

Year circa 1910

Caliber 19''', 3/4 plate, brass, cylindrical pillars, with going barrel, pivoted detent escapement, so-called à bascule, cut compensated balance with gold poising screws and blued steel flat hairspring with terminal curve

Dimensions 46.2 x 81.3 x 118.8 mm.

Signature box

CHF 1,800 - 2,200

USD 1,850 - 2,300 / HKD 14,500 - 18,000


Grading System
Grade: AA

Very good

Case: 3-8

Good

Slightly scratched

Movement: 3*

Good

Overhaul recommended, at buyer's expense

Dial: 3-01

Good

HANDS Original


Notes

Sidereal time
Unit of time used by astronomers; the sidereal day is the interval between two consecutive upper transits of the vernal point in the plane of the meridian. Since in practice this can be measured as the earth's rotation with respect to distant celestial objects, it is called sidereal or star time (sider means star in Latin). The sidereal day is 23 hours, 56 minutes and 41 seconds. The sidereal year contains one more day than the solar year.