Dating pocket watch
Looking at the table of Waltham serial numbers (see example below you can see that number 20,900,000 was made in 1917 and 21,800,000 was made in 1918 (marked in red in the table below).
Around the world, the Hamilton watch is lauded for its innovative design, both functionally and artistically. Wind pocket watch, swiss gold by edmdesigns httpwww some.
Dates are known for Zenith and some for Longines, & Baume.
For most of the other makes the data is not generally available or, as is the case with Revue Thomman, the movements do not carry a meaningful serial number, just a 2 or 3 digit number to identify watches within a batch of production.
Trying to find the correct date of a pocket watch’s manufacture becomes more difficult the older the watch is.
If your pocket watch is after 1850 and of American manufacture it is a relatively easy matter in most cases.