Dating older seiko 5 serial numbers dating show casting call
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 is where knowing the different model and case styles helps!
Simple and quick, this page allows you to determine the exact date of manufacture of a Seiko watch basing on the caliber and serial number printed on the bottom plate or in the edge.
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.
‘Parawater’ continued until the early 1970s when it was replaced by ‘Water Resistant’.
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.
2) ‘CGP’ – this is the Case Material Code – often this is an abbreviation, and is usually self-explanatory as in this example (Citizen Gold Plate).
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.