Swiss silver open faced deck watch by Vacheron Circa 1945

Silver deck watch by Vacheron & Constantin
–
A Swiss silver open faced keyless lever Geneva deck watch, circa 1945.
This deck watch has a silver polished case with an engraved monogram JCB, and punch mark FFBA (Fédération des Fabricants de boites argent). A signed dial is silvered with  Arabic numerals, auxiliary seconds, and blued spade hands. And a signed bridge movement, bevelled, and rhodium-plated, with Geneva Stripes decoration, Guillaume gold screw compensation balance, and index spring fine adjusting device.
–
Diameter: 60 mm
–
Weight: 158 g
–
Signed: Vacheron & Constantin, Geneva