FC31 Frederique Constant Business Timer. Reference FC-270X4P4/5/6. Watch measures a classic 40mm and is made from yellow gold plated steel. Swiss high precision quartz movement. Convex crystal on the front and a closed case back. Waterproof 6ATM or 60 meters. Functions are hours, minutes, day, date, month, week number and moon phase. This watch is fitted with the original brown leather strap in nearly new condition. Naturally this watch is complete with the original box and booklet. A great classic!