Vacheron Constantin. A Fine and Large Silver Keyless Lever Deck Chronometer for the British Hydrographic Service With Wooden Fitted Presentation BoxSigned Vacheron Constantin, Geneva, Movement No. 454'884, Case No. 286'453, Stamped FFBA, Manufactured in 1945Cal. 21''' gilt-finished jewelled lever movement, anibal-brass Guillaume balance, swann neck regulator, silver cuvette, silvered dial, Arabic numerals, outer calibrated fifth seconds ring, center seconds, polished circular case engraved W10/VC7230, H. S. ^2, 54884, case, dial and movement signed, case, cuvette and movement numbered, case and cuvette further stamped FFBA for Fédération des Fabricants de Boîtes en Argent60mm diam.