Rare Swiss deck chronometer with power reserve Circa 1923

Silver open faced deck watch by Vacheron & Constantin
–
An important Swiss deck chronometer with Guillaume balance and power reserve, circa 1923.
Gilt finished lever movement, 21 jewels, large Guillaume balance with gold poising screws, micrometre regulator, chronometer calibre, and special fine adjusting device. Silvered dial with Roman radial hours, outer minutes track, subsidiary dial for the seconds, power reserve indicator, and gold hands. Plain polished silver case. Dome marked CHRONOMETRE, Bulletins de 1ere Classe aux Observatoires de Geneve & Teddington (96.2 Teddington!), 1er Prix au Concours de Geneve. Accompanied with a copy of the original test certificate Geneva 1923.
–
Diameter: 64 mm
–
Weight: 212 g
–
Signed: Vacheron & Constantin Genève
–
This extremely rare deck chronometer was tested three times in Geneva and one time in Kew/Teddington in 1921-23(all test certificates included, chronometer certificates from the database of A. Hidding). The result of 96.2 in Teddington is outstanding! In Geneva, this chronometer achieved its 1st price in 1923! These chronometers are extremely rare, and only a few examples are known.