Your Breitling bracelet might also have a similar production stamp on it that can be used to figure out the date it was made.
The memo displayed below applies to modern watches (from 1991 onwards), and may not be perfectly accurate.
Examples of Breitling 6-digit reference numbers: ).
This has notably been seen on 13050.1 Chronomats, 12023.1 Cosmonautes, but the nature of the enhancement has not been formally indicated (in this case, this be the use of Super-Lumi Nova pigments).
The Breitling reference numbers search engine is an ongoing effort.
Sometime in the 2000’s, Breitling began stamping watches with production dates.