Tank Française 1840

18k yellow-gold automaticAutomaticA mechanical movement wound by a rotor as the watch moves on the wrist. Tank Française, 28 × 32 mm, with guillochéGuillochéDecorative patterns engraved into a surface with an engine-turning machine. Similar-looking patterns do not by themselves establish how a dial was made. silvered dial, centre secondsCentre secondsA seconds hand mounted on the same axis as the hour and minute hands. and date at six. An example was sold new on 13 July 1999 (cal. 220 by the catalogue).