BAUME & MERCIER. AN 18K YELLOW GOLD MANUAL WIND WRISTWATCH. Case Reference Number: 370062. Case Serial Number: 632663. Date: Circa 1980's. Movement: Signed, manual cal.BM 775. Dial: Signed, white, black Roman numerals, black leaf hands. Case: Signed, 18K yellow gold, black onyx set crown. Strap: Black leather strap, signed gilt buckle. Size: 31mm. Weight: 32g.