Case in 18-carat rose gold with a finely fluted caseband. Sapphire-crystal case-back. 38mm diameter. Welded lugs with screw bars.  Water resistant to 3 bar (30m).
Dial in 18-carat gold, silvered and engine-turned in a hobnail pattern. Individually numbered and signed BREGUET. Hours chapter with Roman numerals. Breguet open-tipped hands in polished steel. Hand-wound movement with small seconds. Numbered and signed BREGUET. Cal. 515DR, 15 1/4 lignes, 23 jewels. Power reserve of 96 hours with an indicator at 1:30. Patented high-energy barrel. In-line Swiss lever escapement. Silicon balance spring. 4Hz frequency. Adjusted in six positions. Leather strap.

Also known as: Breguet 5277BR/12/9V6, 5277BR-12-9V6, 5277BR129V6