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Many watch companies made hundreds of thousands of watches, and some companies made millions of watches!
It would be impractical to list the individual serial numbers of EVERY watch made... Our serial number tables list RANGES of serial numbers.
Note that the registration number does not form part of the mark.
The centre is occupied by the abbreviation There are two ranges of year codes; 1842-1867 & 1868-1883.
As well as showing that the design had been registered, diamond mark offered the buyer the reassurance of knowing an item was of British design.
It also assured the person registering the design a degree of protection from copying.
You should consult the serial number table for the specific brand of watch movement you are trying to date by selecting a company from the menu on the left.
Most vintage Swiss pocket watches did NOT have serial numbers and can't be dated by this method.
Exception Notes: In 1857 the letter R was used during 1-19 September, and during 1860 the letter K was used for December.
From 1-6 March 1878, W was used for the year in place of D; and G was used for the month in place of W.
At first glance they look the same but if you look closely you can see that some have a number at the right hand corner and some have a letter.
You can ignore the number at the bottom of the diamond - this tells us how many items were included in the registration, (sometimes known as bundles or packages).