This is an authentic Rolex Datejust wristwatch. The watch has been professionally serviced and comes with a two year warranty. This Swiss watch comes in a nice watch box (generic)
 
Brand: Rolex - Thunderbird  - Oyster Datejust
Model: 16253
Year: 1983
Material: Stainless Steel, 18k Yellow Gold
Band Style: Thunderbird - 50% Stretch
Movement: Mechanical - Automatic
Case: 1 19/32” (36.5mm) wide (not including the crown)
Band width: 25/32” (19.5mm) - 5/8" (15.5mm)
Lug Width: 25/32” (20mm)
Total Length: 8"
Closure Type: Folding Clasp
Total Weight: 103 Grams
Stamps:
Dial - Rolex Oyster Perpetual Datejust Superlative Chronometer Officially Certified Swiss Made
Clasp - Rolex Swiss Made Geneve Steelnox
Features:
Date Counter w/ Magnifier
Non-Numeric Hour Markers

Please note there is a bit of surface scratching to the edges of the casing.