V000001 to V999999), would in fact also be 1 million serial numbers, and worked well with this system.
It is worth mentioning that Rolex would not cease a letter prefix run at the end of a given calendar year, but would continue a letter run until all numbers were used before changing the prefix code.
While it was originally believed that this resequence started over at 100,000, or even 20,000, but evidence suggests that it actually restarted at 10,000 or possibly lower.
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.
The numbers simply represented the two-digit year in which the watch was produced.
Starting in 1990, John compiled his list from a survey of more than 3000 Vibroplexes, their serial numbers, and the date they were purchased, if known.
Owners should apply some common sense to the information in John’s document.
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.
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