1815 Moonphase (Emil Lange) 231.035

The platinum 1815 MoonphaseMoon-phase displayAn astronomical indication showing the Moon’s changing appearance through its cycle, averaging about 29.5 days. Display accuracy and the interval between corrections depend on the mechanism; a maker’s specification for one calibre should not be applied to every moon-phase watch. commemorates Emil Lange’s 150th birthday. Reference 231.035 pairs a black astronomical dial with moon phasesMoon-phase displayAn astronomical indication showing the Moon’s changing appearance through its cycle, averaging about 29.5 days. Display accuracy and the interval between corrections depend on the mechanism; a maker’s specification for one calibre should not be applied to every moon-phase watch. and subsidiary seconds. Sotheby’s identifies the platinum reference and a numbered example from the 150-watch edition; Lange records production in 1999–2000.