18k finely engraved gilt lever movement decorated with scrolls and floral motifs 38 jewels mono-metallic balance pierced and engraved eccentric gold rotor worked open into the letter B silvered guilloche dial outer chapter ring with Roman numerals subsidiary dials indicating day date leap year and month two fan-shaped sectors for 45-hour power reserve and moon phases with lunar calendar blued steel moon hands polished circular case with coin-edge band and down-turned lugs sapphire-set crown sapphire crystal display back case dial and movement signed with an 18k yellow gold Breguet buckle and setting pin on attached chain accompanied by Breguet Certificate of Origin and wooden presentation box