Editorial
The Explorer II 16570 is the Pepsi-less Explorer II, 40mm, 24-hour fixed bezel, black or white (“Polar”) dial, produced 1989-2011 alongside the GMT-Master II 16710 (which shares the case and the caliber 3185). It's the explorer's tool watch from the Rolex catalog that didn't catch the rocket the way the GMT did; consequently it remains one of the best honest-value plays in modern-Rolex collecting.
The Explorer II 16570 replaced the 16550 in 1989, with the same case as the GMT-Master II and the caliber 3185 (later 3186, briefly). Two dial variants: black and white (the “Polar”); no bezel-color variants because the bezel is engraved-not-inserted. The Mark dial generations (I, II, III) carry small print and indices differences that collectors track; the most-traded is the Mark III which entered production around 1995.
Common things to check: dial (Mark I → Mark III have visible differences; Mark I Polar dials are the most-coveted and the most-imitated); hands (the orange 24-hour hand should be a specific shade, service-replacement hands often have a slightly different orange); case (over-polishing rounds the case profile noticeably on the Explorer II); luminous (tritium lume on early production ages cream; replacement Luminova hands are honestly different).
