This Rolex 1675 is among the most desirable early GMT-Masters a collector can pursue, uniting two of the reference's rarest early traits: the gilt "underline" dial — a small line beneath the glossy black dial's printed text, marking the brief switch from radium to tritium and seen on only a narrow band of the earliest examples — and the pointed crown guards, the sharply drawn "Cornino" case found only in the first years of production; all beneath the classic red-and-blue "Pepsi" bezel, for the collector who reads a dial like a fingerprint. It is driven by the automatic calibre 1565, the chronometer-rated movement of the first 1675s, turning the 24-hour hand that, with the rotating bezel, tracks a second time zone alongside the date. The stainless steel Oyster case measures 40mm across with a thickness of 12.5mm, its pointed crown guards and screw-down crown every inch the original pilot's tool. Rare in both dial and case and unmistakably of its era, this is a connoisseur's 1675 of the first order.