A. Lange & Sohne 1815 Moonphase 1815 BrandA. Lange & Sohne Collection1815 Model1815 Moonphase Reference231.031 Country of originSwitzerland Type of watchGents Case diameter35.9 mm Case thickness7.5 mm Power reserve45 hours Limited to250 pieces Limited editionManual windingHoursMinutesSecondsMoon phaseWristwatch