Dating older seiko 5 serial numbers 100 black dating in usa
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.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.Case numbers always start with the number ‘4’, followed by a dash and six other numbers i.e 4-123456.
Case design was also developing and other case types were emerging.2) In the above example you can see how the case number relates very clearly to the movement (7200) 3) ‘STAR’ has now been dropped, and the manufacturer’s name is more prominent.Later watches have ‘Citizen Watch Co’ rather than just ‘Citizen’ As ever, there are variations on this theme – some models, I think only in the Seven Star range, have a ‘horseshoe’ track rather than a full circle, and some backs have no model information – the X8 Cosmotron on the right is marked ‘transistorized’ reflecting the application of new technology, but is not marked ‘parawater’ or ‘water resistant’: Some backs are simpler, with no outer ‘track’ – the Cosmotron on the right below also has a different type of case / model combined number which uses the full movement designation as its first part; it’s also now marked ‘water resistant’ and ‘electronic’ rather than transistorized’: The Seven Star on the left below has the case number in the outer track, echoing the ‘transitional’ format, and on the right a black coated Custom V2 also has a coated back (others had stainless steel backs): Serial Numbers and Production Dates: Dating a vintage Citizen watch is relatively straightforward when it has a serial number on the case back.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.First are two Center Second models from the 1950s, one with an early ‘Everbright’ back – this may be an alloy back rather than stainless steel – and one showing a 40 micron 14K gold filled case, with number only model designation (NB: center second models used that name on the dial, but other models like the Master and Junior also had center second case backs like these): Here’s an Ace Date with serial number, and a fully marked Alarm Date with decorative scrolling- note that this one also shows water resistance – ‘Parawater’: This earlier alarm (left) has a ‘cricket’ type back (double skin with holes to help project the sound) whilst the first automatic from 1958 uses ‘water protected’ rather than ‘Parawater’.