Circa dating system
Therefore, letter prefixes could end at random times of the year, and did not start or stop at the beginning or end of a calendar year.Then, later in 2010, they scrapped the entire system and implemented a brand new "Random" numbering system, in which each watch is issued a (unique) 8-digit "Random" number consisting of numbers and letters.Many have gone out of business, while others destroyed records to save space.Some companies (as with the Gruen Watch Company), even lost rocords to fire or other natural disaster. I am sure they had no idea that their timepieces would someday be collected.BELOW: A close-up view of the same watch, you can clearly see the Serial Number "F982176", engraved into the case at the 6 o'clock position, with "ROLEX" engraved repetitiously around the dial in a circular fashion.In 1927, Rolex began issuing every Rolex Oyster case a unique serial number to distinguish them from one another.While this The following "Round Numbers" Serial Number List has been comprised of known serial number ranges for the years listed.By checking a particular serial number against this list you should be able to date a watch with reasonable accuracy.
Around this same time, Rolex had initiated another dating system--They stamped the inside of the case back with a code consisting of a Roman numeral and two numbers.
An example of this number would be something like "16G9L7F4" and could start with either a letter or number.
This offers them a seemingly endless numbering system by which they could continue indefinitely.
Figuring 8 digits with a possible 36 characters (26 letters and 10 numbers) per digit, gives them over 2 Trillion (2,821,109,907,456 to be exact) possible serial numbers.
Even if they were to omit the letters "O" and "I", to help avert any possible confusion with the numbers "0" and "1" (as they did in the previous numbering system), that would still give them 1,785,793,904,896 possible combinations.