Cal. 502.3 finely hand-engraved and pierced gilt-finished lever movement 38 jewels eccentric engine-turned pierced and engraved gold rotor depicting the letter B the engine-turned two-tone silvered dial with Roman numerals on blank chapter ring blued steel Breguet hands fan-shaped aperture for the 45 hours power reserve aperture for phases of the moon combined with lunar calendar four subsidiary dials indicating month days of the week date and leap year in circular case with ribbed band cabochon sapphire-set crown glazed display snap on back straight lugs 18K gold Breguet buckle case dial and movement signed