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Discussion Starter #1
Hi all, I just bought this June 1971 vfa quartz, the seller and I are wondering if this one is quite rare, the vfa marking just below the Seiko name. Serial seems quite low.
According to the Doensen book the vfa quartz was introduced in 1971, other types came later. Anyone got an older quartz watch? (Other than the awesome Astron quartz :) )
 

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that is a very clean case back and battery hatch - nice watch!
 

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Discussion Starter #4
Interesting. Yours doesn't have the vfa on the dial, different series, different serial? Is the movement also adjusted?
(Very nice one though :) )
 

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Interesting. Yours doesn't have the vfa on the dial, different series, different serial? Is the movement also adjusted?
(Very nice one though :) )
Thats the odd thing about yours. All the early 3823's were non-vfa dial. A snap from the 1972 catalog. I think all 3823 movements have the same spec and are all adjusted.

 

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Love these watches - so important and yet so reasonably priced. Here are mine. Sorry was unable to get pictures of the back of the cases of some of them but here are the serial numbers.
3823 7000 150056
3823 7000 160407
3823 7000 191047
3823 7000 192568
3823 7010 1D1934
3823 7030 270006
3823 7000 330311
3823 7001 400568
3823 7030 490017
3823 7040 471201
 

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My 2 oldests

The 150056 is in my watch box and the 150007 will be in my possession by the end of next week.

My question though is what is the life expectancy of the quartz crystal? I figure that if i have enough of them i should always have one or two i can keep running.
 

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Discussion Starter #12
Very cool!
Life expectancy depends, the crystals were natural crystal at those times. If I'm correct, many companies "aged" the crystals, to stabilise them. It's not the standard 32768 frequency with these early seiko crystals, so replacement is difficult.
Frequency will start to drift, until the circuit can't oscillate the crystal anymore. (Many led watches with the "single digit of death")

All the vintage Seiko quartz watches I have still run very nicely. (After cleaning, lubing)
My omega electro quartz is running slightly too fast, with the trimmer at the slowest position, my Longines Ultra Quartz is running way too fast, and I can't make it run more slowly, apart from replacing the unfindable quartz crystal or circuit.
 

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Battery in or out.

Thanks for your comments. Would life expectancy be extended if the battery is removed?
 

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Discussion Starter #14
No idea. Will the deterioration continue with or without oscillation. Maybe someone has an NOS circuit and can measure the crystal.
 

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I’ve got a couple 38-series from ‘71, below is my oldest, I think. Yours is a little odd- 7-digit serial?

Love these watches - so important and yet so reasonably priced. Here are mine. Sorry was unable to get pictures of the back of the cases of some of them but here are the serial numbers.
3823 7000 150056
3823 7000 160407
3823 7000 191047
3823 7000 192568
3823 7010 1D1934
3823 7030 270006
3823 7000 330311
3823 7001 400568
3823 7030 490017
3823 7040 471201
I recently picked up this 3823-7010 dial and case combo, reasonably priced (looks NOS) - I bought it with the hope of being able to build out a full watch, but finding A) a movement and B) hands and C) bracelet has proven a little - OK A LOT tougher than I had hoped. I have never seen this dial - still can't find it anywhere (VFA on top, most green have no VFA call-out on the dial at all), in any old reference pics. I've seen similar, but not this green dial. Let me know if you have any suggestions, this is my current project. Thank you! JR
445676
445677
 
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