Important Collectors’ Wristwatches, P...

Geneva, Oct 04, 2009

LOT 280

Grasset Patent Barrel-less Watch Isaac Grasset Patent, Genève, No. 732. Made circa 1910. Fine and rare, gun-metal and gilt keyless pocket watch without mainspring barrel built to the design of Swiss Patents No. 5019 and 14528.

CHF 1,500 - 2,500

USD 1,400 - 2,400 / EUR 1,000 - 1,700

Sold: CHF 3,240

C. Three body, "bassine et filets" polished with gilt bezel-rim, hinge and bow. Glazed gilt-rimmed cuvette for viewing the movement. D. White enamel with Arabic numerals, outer minute track, subsidiary seconds. Gilt Louis XV hands. M. 18''', gilt brass, 13 jewels, the mainspring rolled around the winding shaft, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Movement with Swiss Patent numbers 5019 & 14528. Diam. 53 mm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: 2

Very good
Dial: 2-01

Very good

HANDS Original

Notes

Grasset Isaac & Cie A watchmaker and lapidary whose workshop was at 44, rue Wendt in Geneva. He applied for several patents, such as a polishing and lapidaring machine in 1892, a device to set time by means of the pendant in 1896, a micrometric index in 1899, patents No. 5019 and No. 14528 for a helical mainspring rolled around the winding stem.