Here we have a 2021 Rolex Explorer I Two-Tone Steel & Gold 124273 featuring a curvaceous 36mm 904L OysterSteel and 18ct Yellow Gold case, complete with tapered lugs. The polished and brushed surfaces transition with crisp edges. This combination of Steel and Gold is called Rolesor, derived from the brand's name and “Or,” which is French for gold. Rolex patented Rolesor as early as 1933. The Rolex Explorer was developed over 20 years, beginning in the 1930s, in extreme environments. The goal of the watch was to create the perfect mountaineer's tool, keeping the perfect time at -50°C (-58°F) with 70% less oxygen than at sea level. A lug-to-lug length of 43mm and a thickness of 11.5mm ensure a comfortable fit on your wrist. On the right side, a Twinlock double sealing system is featured for the screw-down crown. A smooth, highly polished 18ct yellow gold bezel holds a flat scratch-resistant sapphire crystal above a black dial, the applied highly legible 3, 6, and 9 have an infill of Chromalight, the applied baton indexes have the same infill and the text is precisely printed with the Rolex crown at ‘12’ ‘OysterPerpetual Explorer’’Superlative Chronometer Officially Certified’ printed at 6 o’clock completes this versatile sports watch. On the reverse, a coin-edged screw-down case back, inside we have the Rolex Cal. 3230, considered a very accurate automatic movement with Chronometer Certification of -2/+2 seconds a day, 31 jewels and beating at 28,800 BPH. The use of a Paramagnetic blue Parachrom hairspring for its speed, it’s 10 times more accurate in case of shocks, resistant to extreme temperatures and unaffected by magnetic fields and gravity. It comes paired with its original 19mm Rolex Oystersteel and 18ct yellow gold bracelet, complete with all links. The watch comes with its Rolex presentation box, swing tags and papers.