Case: Polished stainless steel 'oyster' case. Polished stainless steel 'Triplock' locking crown crown ensuring that the crown screws down against the Oyster case as securely as a submarine hatch. Polished stainless steel chronograph buttons with screw-down sleeves. Bezel: Fixed bezel. Polished black 'Cerachrom' bezel, made of highly durable ceramic that is extremely hard, highly scratch-resistant, has excellent corrosion resistant properties & is unaffected by ultraviolet rays so the color will not fade. Platinum PVD filled engraved tachymeter scale on the bezel. Bracelet & buckle features: Brushed stainless steel outer links & polished center links. Oysterlock double-locking deployant clasp Fitted with the patented Easylink 5mm extension link. Dial: Black dial. Applied polished stainless steel index hour markers with luminous fill. Fine printed minute/seconds & fractions of a second track on teh dial perimeter. Polished stainless steel hands - hour & minute hands with black center line & partial luminous fill. Silver rimmed sub-dials with black center. Chronograph/Stop watch function: Column wheel & vertical clutch mechanism. Large central seconds counter hand - accurate up to 1/8th of a second. 30 minute counter sub-dial located at the 3 o'clock position. 12 hour counter sub-dial located at the 9 o'clock position. Continuous running small seconds hand sub-dial located at the 6 o'clock position. Rolex in-house calibre 4130, beats at 28,800 vph, composed out of 290 parts, contains 44 Jewels & has an approximate power reserve of 72 running the time only, or 66 hours with the chronograph function running. Superlative Chronometer certified: introduced by Rolex in 2015, this exclusive designation testifies that the watch has successfully undergone a series of tests conducted in-house by Rolex. The tests exceeds the COSC standards. The certification applies to the fully assembled watch, guaranteeing its superlative performance on the wrist in terms of precision, power reserve, waterproofness and self-winding. The precision of a Rolex Superlative Chronometer after casing should be −2/+2 seconds per day, which is more than twice as good as a standard COSC test (-4+6). AKA: 116500ln-0002 116500