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For example, a case stamped with the number "2106" would indicate that the watch was made in the 21st. Likewise, a bracelet stamped with the number "4807" indicates that the bracelet was manufactured in the 48th. Source: It is believed (although no one seems to be completely sure) that Citizen used a similar serial number dating system to that employed by Seiko (see below).
The first character of the serial number represents the year of manufacture within a particular decade whilst the second two characters represent the month (01-09 for January to September and 10-12 for October to December).
I can at least say thanks to Agent Orange, Jo T, "mach 0.0013137", Mel and K. Serial numbers may be found on movements, case backs or dials depending on the make, model and age of the watch in question. Newer Breitling models (circa 2001 and beyond) may be dated via a number stamped on the case between the lower lugs.
It's not unusual to find movements that are one or two years older than the cases containing them. Perhaps less reliably, stamps on bracelets (circa 1995 and beyond) provide a manufacturing date in the same way.
For the most part, these movements were cased and timed in the USA before shipment to retailers.
Schild 1903 25-jewel: 1967-1971 Airman 1 and SST with A.Featuring the Accutron, Marine Star and their more recent Frank Lloyd Wright and Precisionist collections, Bulova has been an iconic watch brand since 1875.In 1875, Joseph Bulova, a Bohemian immigrant, started the J.Many observers of Bulova watches are confused by the sometimes seen patent dates stamped on the inside of some Bulova watch cases, and they misinterpret such dates as the time of manufacture.In point of fact, those patent dates apply only to certain aspects of the case design and indicate only when those general designs were patented.