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Gold filled watches were also marked to show the quality of the gold used, e.g ’14K’ 3) ‘Stainless Back’ – the case back material is often stamped, particularly when the case is of a different material.4) General & Specific Model Names – in this example the general model range is Homer, which is gleaned from the movement name.(late '67 / early '68 transition to 6 digit serial numbers). This means the watch was made in 1976 (the first 6) in April (the number 4).Of course the year could be 66, 86, 96 or even 2006.Here’s an example from 1963, which carries all the information to be found at that time except water resistance – see the labels for their meaning: Notes: 1) ‘STAR’ – as far as I know this the mark of Citizen’s own case factory.
Some gold plated and especially gold filled watches specified the thickness of the gold, in microns.
Each of these used various case designs, with different case materials, and the case back markings began to reflect this.
I have identified three core formats, and I’ll show these in the following sections, along with some of the variants that can be found – one of the joys of this for the collector is the variety of case backs that occur as result.
And not all case backs carried all the markings – some were minimally stamped and very simple whilst some were decorated, often with scrolled engraved lines.
After looking at a fully marked example, I’ll show some of the variations.Introduction: Over the years Citizen have changed their watch case back markings, whilst they have also used special backs on their high grade watches and certain specific models.