Case in 18-carat rose gold or platinum with a finely fluted case band. Sapphire case back. 41 mm diameter. Welded lugs with screw bars. Water-resistant to 3 bar (30m). Skeleton dial in silvered 18-carat gold. Individually numbered and signed BREGUET. Hours chapter with Roman numerals on a sapphire disc. Breguet open-tipped hands in blued steel. Retrograde dates indication at 12 o'clock, days at 9 o'clock, and months and leap years at 3 o'clock. Small seconds on the tourbillon axis. Manually wound movement with tourbillon and perpetual calendar. Numbered and signed BREGUET. Cal. 558QP3. 14 ½ lines, 21 jewels. Power reserve of 50 hours. Lateral lever escapement and balance with adjustment screws on a Breguet spring. Frequency 2,5Hz. Adjusted in six positions. Leather strap with a triple-blade folding clasp.