Ronde Louis Cartier watch

Ronde Louis Cartier 40 mm, mechanical Manufacture with self-winding mechanism calibre 1904-PS MC, case in 18K rose gold, circular-grained crown set with a sapphire cabochon, silver grained dial, Roman and Arabic numerals, apple-shaped blued-steel hands, sapphire crystal, brown semi-matt alligator-skin strap, 18K rose gold ardillon buckle, small seconds at 6 o'clock and date at 3 o'clock, sapphire case back, thickness 9.2 mm, water resistant to 3 bars (30 meters/100 feet).