A. Lange & Sohne 1815 Walter Lange Up and Down 1815 BrandA. Lange & Sohne Collection1815 Model1815 Walter Lange Up and Down Reference223.021 Country of originGermany Type of watchGents Case diameter37.5 mm Case thickness9.3 mm Power reserve45 hours Water resistance25 m Limited to50 pieces Limited editionManual windingHoursMinutesSecondsWristwatch