Important Watches, Collectors’ Wristw...

Hotel Noga Hilton, Nov 14, 2004

LOT 350

Eduard Koehn, Genève, No. 78444, made for Tiffany circa 1905. Very fine 18K gold, keyless minute-repeating dress watch with split-seconds chronograph and instantaneous 60-minute register.

CHF 12,000 - 16,000

EUR 8,000 - 10,000 / USD 10,000 - 13,000

C. Four-body, ?bassine?, polished, gold hinged cuvette. D. White enamel, Breguet numerals, outer minute divisions, outermost chronograph track divided into fifths, register at 12, subsidiary sunk seconds at 6. Blued steel ?spade? hands. M. 37 mm (17'''), 38 jewels, straight line lever escapement, cut-bimetallic compensation balance with Breguet balance spring, ?swan-neck? micrometric regulator, Koehn patented chronograph mechanism, repeating on gongs through activating slide in the band.Signed by the retailer on dial, case, and movement.Diam. 46 mm.


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Grading System
Grade: AAA

Excellent
Case: 3

Good
Movement: 3*

Good

Overhaul recommended, at buyer's expense
Dial: 3 - 01

Notes

On November 15, 1902 Koehn was granted a patent for an instantaneous minute register in chronograph mechanisms. He implemented it in this watch. Interestingly, the serial numbers of the series of watches he destined for Tiffany coincides with the series of numbers destined by Patek Philippe for Tiffany, which has caused some confusion. This is a rare case, in which the maker may be identified without a doubt.