Here is a very good condition and unpolished reference 1665 with engraved serial production 5,7xxxxx circa 1978 known as the Rolex « Deep Sea ». The original MKX dial with extreme pumpkin patina perfectly matches the nice black serif fat font bezel. Caseback is dated 1978 as well as stamped 1665. The watch comes with original box. The watch is serviced and guaranteed 1 year.