Accuracy of Spring Drive
Having recently purchased a pre owned Grand Seiko GMT spring drive I was curious to the accuracy of this movement. It's stated to 1 second per day, although this is accurate and better than COSC I know Seiko tend to play it safe and are usually well within their stated accuracy, even the old 7s26 movement is published at -20 +40 but with most I've had and a quick regulation most of mine were within 10 seconds per day. Well after a month of testing and in various wind states, although I don't know if it makes a difference, I was really impressed. Now I know some people will say it's just a quartz or it's cheating I think it's innovation using the best parts of a mechanical and a quartz.
Yes after a month it worked out at +.30 seconds a day. Impressive to me
Addicted for years. Interested in military themed watches
Mine is also right around +0.3/day, and I've heard this from others anecdotally as well. I think this is roughly what they aim at, rather than +/-0, so if anything it runs very slightly fast, rather than slow.
Seriously impressive movements.
My SD has lost maybe 3second after 5 months. It's great.
Within 1-2 a day on mine.
Between March and June, mine gained 6 seconds, or less than .1 second per day. Last year between March and November (from begin to end of DST), it also gained 6 seconds. Somehow it got faster, not that I'm complaining. Is it the temperature? How much I wear it?
That's awesome. Kind of cheating, kind of not, but really fun to watch (get it?) either way.
This is great info! I don't know too much about the spring drive, other than a video I watched from Teddy B. on YouTube. Seems cool, and good to know that it's keeping good time for most folks new/preowned.
Between March and June, mine gained 6 seconds, or less than .1 second per day. Last year between March and November (from begin to end of DST), it also gained 6 seconds. Somehow it got faster, not that I'm complaining. Is it the temperature? How much I wear it?
I would be lying if I I said I knew exactly how a spring drive works. Not sure if the quartz is thermo compensated like their high accuracy quartz. To me it seems like a great idea to use something tried and tested for its accuracy. The other ideas like tourbillon are great but then bring up the costs with negligible results.
I would be lying if I I said I knew exactly how a spring drive works. Not sure if the quartz is thermo compensated like their high accuracy quartz. To me it seems like a great idea to use something tried and tested for its accuracy. The other ideas like tourbillon are great but then bring up the costs with negligible results.
The standard 9R65 Spring Drive movement is not thermocompensated, but the newer 9RA5 is, bringing the stated accuracy from 15 seconds a month to 10. But most Spring Drives do much better than that anyway. And they're still nowhere near the 10 seconds a year accuracy of their 9F quartz. It's remarkable they can do any thermocompensation at all with the extremely low power of a Spring Drive.
You don't buy a tourbillon for it's accuracy, you by it because it looks cool, and, well, because it's expensive. When they talk about tourbillons, they never talk about accuracy. High horology watches are not known for their accuracy, and that's not why you buy them.
Mine is also right around +0.3/day, and I've heard this from others anecdotally as well. I think this is roughly what they aim at, rather than +/-0, so if anything it runs very slightly fast, rather than slow.
Seriously impressive movements.
Right on, mine gains about a second or two in a month.