Today’s Watch – Citizen Seven Star V2, 21 Jewels

As the first week of ‘lock down’ nears its end here in the UK, I’ve started wearing some of the watches in my collection that don’t get (much) wrist time, partly to see if any are in need of some TLC. So I’ll do a daily watch post to match 🙂

After yesterday’s high beat Leopard model, I’ve come down a notch to a Seven Star V2, made in December 1970. I particularly like the hour markers on this one:

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The 21 jewel calibre runs at 21,600 bph, and is part of the family that includes the Leopard range. The Seven Star line initially used the 52 movement, whilst the V2 models adopted the 72:

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On its original bracelet, this one is running just fine:

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Stay Safe, Stay Well

I hope everyone is keeping well during the Covid-19 crisis. It’s a strange time across the world at the moment with the ‘lock down’ measures most if not all of us are experiencing.

It is also a very sad time for those who have lost loved ones, whilst health workers and other front line staff must get our total support and best wishes for their own health.

The passage of time becomes all the more in focus as we live through this pandemic. Today’s watch is a high beat (28,800bph) Leopard, with 26 jewels the case number is 4-720458 and was made in March 1970:

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Quartz, but collectable…..

Although my collection covers Citizen’s mechanical and electro-mechanical watches, I have had to scratch a certain itch – and that is Citizen’s early quartz watches. I came to realise and appreciate that before mass production kicked this new technology was used in high grade and well made pieces. At the time, i.e. the early and mid 1970s, Citizen’s quartz models were the most expensive in their model line-up, reflecting the innovation and accuracy that quartz driven movements brought to the market. They were built to the same standards as high end mechanical models, and were capable of being serviced and a long life as a result.

Given all this, early examples of Citizen’s quartz revolution are very collectable. Some are very rare. For example the super accurate ‘4 Mega’ models with an annual accuracy of +/- 3 or 10 seconds is quite a thing – the top of the range retailed at 4.5 million yen in 1977!  I haven’t got one of them 🙂

More typically, early quartz models ran at +/- 15, 10 or 5 seconds a month, depending on the movement, with the 5 second models described as ‘EFA’ (extra fine accuracy). Compare that to the chronometer grade mechanical watches at that time, where +/- 5 seconds a day would be pretty good, and it’s clear why quartz became the predominant technology.

Although I’ll do a ‘Featured Watch’ post on each of these at some time, here’s a quick look at my three examples of Citizen’s early quartz models – first, a pic:

And I’ll start with the one at the centre, since this uses Citizen’s very first quartz movement, launched in 1972 – amazingly it retains a hairspring, as seen in the Cosmotrons. The 16,384Hz quartz oscillation in this 8811 movement is converted to 16Hz so the watch runs at 16 beats per second – 57,600 beats per hour! My example is from October 1973. The 8811 has an accuracy of +/- 10 seconds a month – the 8810 version is the EFA variant, i.e. +/- 5 seconds a month.

The 88xx movement was soon superseded by fully electronic movements, and the watch on the right is from August 1974. This has the 8600A movement and is an ‘LED’ model – the small LED lamp at 12 o’clock flashes every 60 seconds, with a +/- 10 seconds accuracy per month. The 8600E variant is the EFA version. Mine is marked ‘QUARTZ’, so it’s an early one, since from around October 1974 they were marked ‘Crystron’.

Finally, the one on the left is an unusual and rare Crystron, probably from around 1977/8. The dial is marked EFA, as is the 8560A movement, so it is a +/- 5 seconds a month watch. I have only found one other example of this model on the internet. The case is also interesting, and a rare type. It’s marked ‘IG’ which indicates a stainless steel case with a mirror finish titanium nitride (i.e. gold colour) coating. It is a nice alternative to a standard gold plated case, with a paler and more subtle colour.

Can’t help but like these 🙂

 

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Citizen’s 17 Jewel 150m Divers

I’ve just added information about the 17 jewel versions of Citizen’s 52-0110 and 51-2273 150m divers to my diver reference page. Both models can be identified externally by the lack of a jewel count on the dial, and internally by ’17 jewels’ engraved on the rotors. Both use versions of the 8200 movement. Here’s a link to the page: https://sweep-hand.org/citizens-vintage-divers-1962-to-1980/

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New Addition to the Speedy Page

Just added Brian’s latest restoration to his 67-9313 ‘Speedy’ page. This is number 29, and here’s a quick link to the page: https://sweep-hand.org/brians-8110a-restoration-the-speedy-67-9313/

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Message for ‘Francesco’ about his 7803 Cosmotron

I had an enquiry from ‘Francesco’ via the enquiry form about his cosmotron. Unfortunately my reply is coming back as ‘undeliverable’, maybe because his inbox is full 😦

Hopefully Francesco will see this – and here is the reply I tried to send via email:

‘Hi Francesco, thanks for visiting my blog. I am not a watchmaker myself so I only have limited technical knowledge. With monobloc cases you have to remove the bezel and crystal, and there should be a lever that can be moved to release the stem so the movement can be removed from the case. Here’s a forum thread that will help:  https://www.thewatchsite.com/34-watchmaking-tinkering/136306-help-citizen-7803-monocoque-removing-movement.html  You need to scroll down a bit to find a pic of the dial side showing the lever. And the original poster says that the lever is pressed down to remove the stem. Hope you can sort out the problem’

 

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Images are Back!

Looks like Photobucket has sorted their problem out, and my images are now visible again – please let me know if you encounter any issues, thank you.

 

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