Rolex’s GMT-Master was one of the most revolutionary timepieces available when it was first released in 1954. The famed reference 6542 with Bakelite bezel set the standard for all other dual-time wristwatches that followed. Introduced at the dawn of the “Jet Age” and developed in collaboration with Pan-Am airlines, it featured an historic innovation that permitted travelers to simultaneously tell time at both their “home” and “local” destination. The model is so cherished by watch collectors and enthusiasts that sixty-five years after it was first introduced, it remains one of the brand’s top selling wristwatches. The GMT-Master evolved over the decades with design changes including the use of a metallic bezel in place of the fragile Bakelite bezel and the addition of crown guards. A major upgrade came with the introduction of the GMT-Master II in 1983, employing for the first time a quick-set hour hand that could easily be moved forwards and backwards.

The present reference 16710 is one of the rarest of all GMT-Master II models due to several elements. A transitional model that preceded the use of ceramic bezels for the GMT Master II line, it’s fitted with what’s known as an “error dial”, or “stick” dial, and at the same time, features an upgraded caliber 3186 movement. The nickname “error dial” comes from a slight change in the script signature, with the “II” in the GMT-Master II text at 6 o’clock lacking the top and bottom horizontal lines for the Roman numeral “II” as was most often used. The caliber 3186 was an upgraded caliber with a Parachrom hairspring, and while it was for use in the new model GMT-Master 116710, these calibers were also found on late examples of the 16710 M series.

The present M series reference 16710 remains absolutely unused and is particularly attractive with its pristine case, rare “error” dial, caliber 3186 movement, and original red and blue “Pepsi” bezel—a complete watch for the connoisseur who seeks an uncommon and rare modern sports watch.