AN 18K GOLD AUTOMATIC CALENDAR 'OYSTER PERPETUAL DAY-DATE' BRACELET WATCH, BY ROLEX, CIRCA 197026-jewel Cal. 1556 automatic movement adjusted to temperature and 5 positions, silver dial with applied gold and black baton hour markers, gilt baton hands with luminous inserts and sweep centre seconds, magnified date aperture at 3 o'clock, English day indication aperture at 12 o'clock, brushed and polished tonneau shaped case with screw down back and Oyster crown, fluted bezel, fitted 18K gold bracelet with folding deployant clasp, case, dial and movement signed, ref. 1804, serial no. 40588**, with maker's leather box, case width (including crown): 3.7cm