Cartier Tank Française 1840

A Cartier Tank Française Automatic 18ct gold cased gentleman's wristwatch, Ref. 1840, with signed and jewelled movement, the signed silvered dial with black Roman hour numerals, secret signature at 7 o'clock and date aperture, the signed case back detailed '18K 1840 MG259749', the signed brown leather strap with signed 18ct gold buckle, case width 2.9cm, total weight 51.4g.