The Explorer name was found on Rolex watches long before the Explorer that is considered to be the Explorer 1, model 1016. The dials on the earlier versions of Rolex Explorer watches were many and varied. So don't assume a re-dial. Several years ago, a friend bought an "Explorer 1" from a prominent dealer. The case style number was 5500. The dial was not a genuine Rolex dial, but it was marked Superlative Chronometer, Officially Certified. Inside the case was a non- chronometer, Air King movement! Someone had replaced the dial of a model 5500 Air King with a bogus Explorer dial, and sold it as the real thing! The dealer was good about it, though. He exchanged the Frankenwatch for a real Explorer 1 for the same money!