Dating older seiko 5 serial numbers rules on dating in the army

Model names are not often seen on the back, but some now indicate the movement to be found inside – this is very helpful of course!

Here’s a typical example of a fully marked back: Notes: 1) I have not been able to determine the system, if any, for model numbers – they generally do not help to identify the movement used.

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.

It is found on watches from the 1940s through to the late 1960s.

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.

More and more watches were using screw on backs and less were using the snap on type more typical of the early model ranges.

Case design was also developing and other case types were emerging.

7) This example has no indication of water resistance – watches were increasingly marked ‘Parawater’ after 1958 when Citizen designed water proof cases for the first time.This watch has a day window only, and is therefore known as a Homer ‘Weekly’.Other models also use the Homer movement, so will carry their own model name, e.g. Model names on the case back are more common in the early models than later pieces.Acknowledgement – in order to get a uniform type of image and size, I have primarily used the Japanese Domestic Watch volumes as a source, I wish to give due acknowledgement and credit here.Early Case Backs: This section relates to watches made from around 1950 to the early 1960s.

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