A. Lange & Sohne 1815 Chronograph 1815 BrandA. Lange & Sohne Collection1815 Model1815 Chronograph Reference402.026 Country of originGermany Type of watchMen's Case materialWhite gold Case diameter39.5 mm Case thickness10.8 mm Power reserve60 hours Manual windingChronographHoursMinutesSecondsTransparent casebackWristwatch