MODEL: 1680 S/NO: "520xxxx" SERIES YEAR 1977. Automatic Rolex movement 1570, 40mm case in excellent condition, stainless steel bezel with original Rolex Flat 4 Rolex aluminium insert. Original Rolex stainless steel oyster bracelet at 98% mint condition. Very rare model. The original Rolex Mark 1 dial in super perfect condition, must view to appreciate this rare beauty........