it sounds as if the dial is incorrect...I believe it should be "Precision" or maybe "Super Precision" but not a certified chronometer. If that is correct, the watch in question is not worth pursueing unless you are willing to buy a watch that you will have great trouble selling at some future date. If I am wrong, it is still one of the lower level Explorers, not one of the more sought after versions.
Is the case a 36mm w/ 20mm lugs...if so, all the better. If it is the 34mm w/ 19mm lugs, it is again one of the lessor desired versions.