Tank Américaine 1735

The large manual-wind yellow-gold model that made the Américaine’s name: about 44–45 × 26.5 mm and 8 mm thick, curved sapphire crystalSapphire crystalA watch glass made from transparent synthetic sapphire, valued for its resistance to scratching., no seconds hand or date. Silvered wave-guillochéGuillochéDecorative patterns engraved into a surface with an engine-turning machine. Similar-looking patterns do not by themselves establish how a dial was made. dial, railway track curved like the Cintrée’s, Roman numerals with the secret signature in the VII, blued sword hands, octagonal crown with a sapphire cabochonA stone polished into a smooth dome without facets. In watches, cabochons can decorate the crown or dial; the term describes the cut rather than a particular gemstone., eight-screw back.