Explorer Watch

The explorer's watch and the field watch share functional roots, but they are not the same thing: the field watch was born to tell time in battle, the explorer's watch adds features designed for extreme environments, caves, high altitudes, polar expeditions. The distinction is not aesthetic, it is conceptual.

The most studied historical reference point is the Rolex Explorer II ref. 1655, called the Freccione for its wide orange arrow-shaped hour hand. That nickname says everything about the visual character of the model. The additional 24-hour hand on the 1655, however, is not a true GMT hand: it is not independent from the hour hand, it does not allow reading two separate time zones. It is a pure and simple day/night indicator. To compensate for the lack of lume on the fixed bezel, Rolex added 24 tritium indices on the dial, so reading remained possible in darkness. Remembering that 12, 3, 6 and 9 were six hours apart on the scale was sufficient. True GMT functionality only arrived with the 16550.

On the dials of the 1655 and subsequent generations appear two distinct markings: T SWISS T for simple use of luminescent tritium, T SWISS 25 T (from the Mark IV onwards) to indicate emission below 25 millicuries, in compliance with radioactivity regulations. It is not a decorative detail: it is a declaration of conformity.

References 16550 and 16570, today classified as neo-vintage or youngtimer, are among the most sought after on the secondary market. The 16550 with cream dial has a very rare variant called Rail Dial: the "C" in "Chronometer" aligns perfectly with the "C" in "Certified" in the lower line. It is a typographic particularity, not functional, but collectors pay for it. The 14270, Explorer I, in turn has a variant called Blackout: the numbers 3, 6, 9 filled with black enamel in the first production run. It is the most expensive version of the reference.

On the 216570 arrive the Maxi markers, larger to compensate for the 42 mm dial. On the white dial, called polar dial in collector jargon, they maintain the black outline; on black, they are in white gold. The Explorer lugs, the case horns, start straight from the widest point of the case: utilitarian geometry, no twist, much copied. The Easylink system on the 226570 allows extending the bracelet by approximately 5 mm without tools. Useful on expedition with gloves. On the 3185 caliber the GMT hand tends to oscillate slightly during adjustment: it does not compromise accuracy, but those who don't know this worry.