The Rolex Explorer is often overshadowed by the Daytona , Subs, the GMT’s. However, the Explorer is one of the hidden jewel in the vintage Rolex world and one of my favourite. Even within the Explorer series, there are many models from 6610, 1016 plus the air king explorer 5500, 5504, and the made for Canada dress watch 5501, 5701 Explorer plus the Explorer 2, 1655, 16550
Even within the Rolex 1016, there are the Matt dial, the gilt dial and the tropical dials
You can quickly identify a 6610 from a 1016 Explorer by the script at 6 o’clock. A 6610 will say "Officially Certified Chronometer," while a later 1016 will read "Superlative Chronometer Officially Certified."