Rolex. A fine and rare platinum and diamond set automatic centre seconds calendar watch
"Day-Date" Ref:1804, 1960s
26-jewel Cal.1555 movement, monometallic balance shock-absorber, self-compensating Breguet balance-spring, adjusted to five positions and temperature, fine silvered dial with day and date aperture, diamond set hour markers, polished tonneau case with 46 brilliant cut diamonds in the bezel, screw down Oyster crown and screw back, fitted platinum President bracelet, with locking clasp, together with original chronometer certificate dated 28th March 1963, case, dial and movement signed 39mm.