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Note that we're using the serial number from the watch movement, not from the watch case.
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). Your movement serial number may not be in exactly the same location as the one in the photo, but you are looking for the serial number that is on the watch mechanism itself... This is an example using the Waltham serial number table.
Some American watch brands did not use a consistent series of serial numbers, but most of the big manufacturers did.
It would be impractical to list the individual serial numbers of EVERY watch made... Our serial number tables list RANGES of serial numbers.RA-1 is repeated twice and it should be noted that the re-setting of the number marries up with the new Doulton lion and crown mark. are many and varied as Doulton marked their wares from the very start.The extensive range of Doulton products meant a reasonably complex set of marks and way of marking was required.Instead, the best approach to dating a Fender is to combine indicators from the design of the instrument, the dates found on the neck and body, along with the serial number.Once you have the information you need, if you're interested in selling your Fender, you can use Reverb to get it in front of the largest audience of musicians in the world by clicking on this link.