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1. #How do you tell seiko model number serial numbers#
2. #How do you tell seiko model number serial number#

#How do you tell seiko model number serial numbers#

Citizen also used seven digit serial numbers on some models in the late 1960s and early 1970s, so I’m sure your case back is as it should be.

#How do you tell seiko model number serial number#

By the way, have you typed the serial number correctly? I don’t think I’ve seen one with 10 digits before, would normally be 8 for this age of watch.įortunately this hand winder is actually not too tricky. The next two give the month – 09 – so it’s September 1973. I don’t believe these were made beyond the 1970s. The first three digits are the key ones – the year is indicated by the first number, so this one is from 1973 since we know the 6501 was first made in 1971. Not as useful as the case number since it doesn’t indicate the movement insideģ092121293 – this is the serial number, and this gives us the production date. They were first produced in 1971 and had only a short production run since the quartz movements became Citizen’s primary focus in the mid 1970s and they significantly reduced their range of mechanical watches from that point on.Ĥ-651171 – this is the case number and would have been used by watch makers when servicing / repairing, it also indicates the movement usedĦ1-6231 – this is the model number. The 6000/6001 are the date only versions. The 6500/6501 movements are the day and date versions of the 6000 movement series.

Here’s what the markings on the back tell us:Ħ501 – this is the movement number (if you can get the back off you should find this number stamped near the balance wheel). You may know some of this already, so sorry if that’s the case. Even in excellent condition the value would not be particularly high – my usual advice is to search eBay and look for completed listings to get some idea. Value is a difficult area, so I avoid giving valuations! So much depends on condition / location etc, and demand for vintage Citizens is limited. I’ve noticed that the movement is number 5270 on mine – I’m interested to know if yours is the same – if so I need to amend the Family Tree slightly since I’ve only referred to this being used in the Seven Star models: The crown is signed, on mine it has the older style ‘C’ – yours could have this or the later ‘CTZ’ which was starting to be used at that time: Here’s the movement – yours may not necessarily have a black rotor:

The serial number is 9041587 – the first three digits provide the production date, so this one is from April 1969. It’s marked ‘parawater’ which Citizen used instead of waterproof up to the early 1970s – after that water resistant had to be used. Mine is not in very good condition although the movement is good and runs well (I think I got this in a swap for a Seiko parts catalog) – here’s the back: The case number is 4-520131, which indicates the movement inside, a 21 jewel version. If yours is the same as mine, there is no model number. There were ‘Custom’ models as well, which were of a more modern design (for that era) with higher jewel counts so were more expensive – although yours is not a Custom, it is similar to some of the Custom designs. Parts are not available other than from a donor watch, so hopefully yours doesn’t need anything more than a service. In good condition these are very nice, reliable and accurate movements running at a standard 18,000 beats per hour – after yours is serviced it’s likely to be running very well. The ‘7’ relates to the features of the watch – I’ve not found exactly what the seven are though! They were produced up to the late 1960s, and are one of Citizens better known vintage lines, with a wide variety of models. Other models used this movement too (see the 52 Family Tree: ) but the Crystal Seven is characterised by having date and day complications, with a quick set mechanism for the date, and flat mineral glass – hence the ‘crystal’ part of the name. The Crystal Seven models were introduced in 1965, using the ’52’ movement. It’s great to hear that you have inherited your grandfather’s watch. Thanks for confirming which watch it is 🙂