Rolex brand Model (Watch) Explorer II Reference number 16550 Automatic winding Case Material Steel Strap material Steel Year 1986 Kit No original Rolex documents, no box Overhauled and reconditioned and one-year shop warranty Calibre 3085 Automatic winding Case Material Steel Diameter 40 mm Waterproof 10 ATM Bezel material Steel Glass Sapphire crystal Black dial Numerals on the dial Without numerals Strap Strap material Steel Strap colour Steel Clasp material Steel