A mahogany two-day marine chronometer, Vacheron & Constantin, Geneva, No. 364959, silvered dial signed and numbered Vacheron & Constantin, Geneve, 364959 Roman hour numerals, gold hour and minute hands, subsidiary seconds and up-and-down dials with blued steel hands, cut bimetallic balance with cylindrical heat compensation weights, helical blued steel balance spring, Earnshaw escapement, spring foot detent numbered brass bowl, gimballed in three-tier mahogany box, the middle section with rectangular ivory plaque inscribed Vacheron & Constantin, 364959, the top lid with inlaid brass cartouche (blank) -- 103mm. dial diam., 185mm. sq. box.