8,850 CHF
"Split Seconds Deck Chronometer" Ulysse Nardin, Locle, Suisse, No. 17987, case No. 390156. Made circa 1940. Fine and unusual, "Staybrite", keyless circuit breaker lever deck chronometer with split 1/10th second chronograph with two times 30-second revolutions, instantaneous 15-minute register and Guillaume balance. White enamel, bold Arabic numerals, outer minute track, outermost 10th of a second divisions and Arabic 3-second numerals, subsidiary seconds at 6, instantaneous 15-minute register at 12. Blued steel "spade" hands. Notes The present watch is very unusual as it is calibrated so that 30 seconds are recorded in one revolution of the chronograph hand instead of the usual 60 seconds per revolution. This is achieved by a fast-beating escapement; the hour and minute hands are geared to operate in the usual manner. This chronograph was specially made to time events to a precision of 1/10 second. Breitling has recently used this system for its Breitling for Bentley range of chronograph wristwatches, as have De Bethune for their new chronograph.
Auctioneer:
Antiquorum
Date:
2006-11-12
