USA manufactured bracelets differ in their stampings to their European counterparts in that many bracelets have no date at all and those which are dated are month/year stamped rather than quarter/year.
There are perhaps no watch manufacturers with a more famous and widely known name than Rolex.
The assigned case reference number of this first Submariner was either 6204 or 6205.From 1976 Rolex again started dating bracelets but this time with a letter to designate the year and number to designate the month of manufacture.So for instance, from the table below, we can denote that a bracelet stamped F7 was manufactured in July 1981. The table below should help you date your rolex bracelet.(I’m not entirely sure why Rolex offers some of its technical models in gold, but not others; you can get a GMT Master II in yellow gold, for instance, but the Explorer II comes in steel only, for reasons only Rolex would know.) But it’s always going to seem more natural to get a technical Rolex in steel, and while a Datejust in gold can be a beautiful thing, the The Day-Date 40 was released at Basel 2015; it is the successor to the Day-Date II, which was 41 mm in diameter and which Rolex released originally in 2008.
The 36 mm Day-Date remains in the catalogue, unchanged, offering those who want to experience the Day-Date in the size in which it was first offered in 1956 a chance to do so, and both the the 40 mm and 36 mm versions of the Day-Date come in a plethora of materials and dials.
Rather, both of these early submariners have straight "pencil" style hands.