An example of this number would be something like "16G9L7F4" and could start with either a letter or number.
This sequence continued through November 1991, when a new numbering system was introduced utilizing the letters N, C and S, which took them through 1993.
In 1994, Rolex started yet another sequence with the letters: W, T and U, then A, P, and K in subsequent years, followed by Y, F, D, Z, M, V and then G in 2010.
Please note, during the 1990s and 2000s, it is estimated that Rolex produced around around 1 million watches per year.
Coincidentally, the numbering sequence of any particular Letter from this system (e.g.
Please note, some examples (primarily from around 1959), did feature the Roman Numeral and a 4-digit year (i.e. The system started with the letter "R", whcih was then subsequently followed by L-E-X.
Thus spelling out the word "ROLEX" with the "O" being omitted, to help avert any possible confusion with the number "0".
The Roman numerals were I, II, III, IV, which represented which quarter of the year the watch was produced.
The numbers simply represented the two-digit year in which the watch was produced.
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ABOVE: Around 2005, Rolex started engraving the Case's Serial Number into the inside edge of the case (at the 6 o'clock position, under the crystal and below the bezel), also known as the rehaut, as shown in these images, which were taken at BASELWORLD 2005, in Switzerland in early April.
Therefore, the code "III 53" would represent the 3 quarter (i.e.