Rolex, Oyster Perpetual Date Submariner, MK VI Single Red Dial, ref. 1680, a stainless steel wrist watch, no. 3427571, circa 1973, automatic movement, 26 jewels, cal. 1570, adjusted to 5 positions and temperature, black dial, dot and baton markers, luminous pointed baton minute and Mercedes hour hands, centre seconds hand, date aperture at 3 o'clock, rotating bezel with black insert, Arabic numeral 10 minute track, screw down crown, screw down case back, on a non original brown strap with stainless steel pin buckle, case back, dial, movement and crown signed, accompanied by a Rolex service pouch and service guarantee card dated 11th October 2012, diameter 39mm The ref. 1680 was introduced in 1969 and was the first Submariner to come with a date function. During the first four years of production, the dials came with red writing on the dial. This makes them highly sought after among collectors. There were seven variations of the dial and this example comes with the Mk VI dial. This dial can be identified by having feet first and closed 6s. It was common for these red dials to be replaced during a service, so it is not known how many are left in circulation.