Rolex stainless steel Explorer II, automatic, size 40mm. Rolex ref. 16550 with a stainless steel case and service replacement 93150 Oyster bracelet with date code V5, white Polar dial, matching patina markers and hands, magnified date display, sapphire crystal. "R" serial, circa 1987. Six months full warranty. 

Maker: Rolex
Model: Explorer II
Reference: 16550
Year: 1987
Case Size: 40mm
Crystal: Sapphire
Caliber: 3085
Bracelet/Strap: Bracelet
Box/Papers: No

Grade: Excellent. The 16550 was a transitional model produced between model 1655 "Steve McQueen" and its predecessor, reference 16570. Produced for about five years, from 1984 to 1989. It was the first Explorer II that had an independently adjustable GMT hand which could be set without stopping the movement.