Call me confused here but..........you say the Spring Drive doesn't work on a winder then proceed to put it on one for 5 days ? Which part of that makes no sense at all ??

 

I said it doesn't work on a timer, a watch timer. Spring drives don't tick so nothing for the watch timer to count.

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I said it doesn't work on a timer, a watch timer. Spring drives don't tick so nothing for the watch timer to count.

I guess you mean a Timegrapher, and yes it does make sense that a Timegrapher won't be able to measure the instantaneous accuracy of a Spring Drive.

 

So far at +1 days I'm maybe a quarter second behind, but that could have been my initial setup.

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Brandon, in case it performs less impressively in the following days and you're so disappointing that you decide to shift it, send me a pm please.

 

+.3 a day [emoji106]

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Day 2. Looks like 1.5 seconds behind. Might be temp., the room is on the third floor of my house and I let the thermostat adjust during the day

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Day 3. Back to dead on.

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Day 4, maybe quarter a second fast.

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Day 7, still that 0.5 seconds behind. Pretty good I think.

I'll probably keep the experiment running and update this every so often.

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Your next experiment should be 7 days of normal daily wear to see real world performance.

 

Your next experiment should be 7 days of normal daily wear to see real worl performance.

Good point. I'll do that next week. Without a balance I'm not sure it will matter but worth taking a look.

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I look forward to hearing the results.

 

Starting phase two, confirmed about 0.25 seconds behind.

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Day 1 of phase 2 (on the wrist), 0.25 fast.

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Day 3 of on wrist, dead on.

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Day 7 of on the wrist, maybe a quarter of a second fast.

So after 14 days of paying attention to the timing I'm 0.25/14 seconds fast, or 0.0178 seconds per day.

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Day 7 of on the wrist, maybe a quarter of a second fast.

So after 14 days of paying attention to the timing I'm 0.25/14 seconds fast, or 0.0178 seconds per day.

So, effectively not worth worrying about and devoting any more time to then ?

 

I'll probably keep it running until I hit 30 days and call it good

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I've been told never to keep my Grand Seiko on a winder especially due to it being a Spring drive.

 

Why not? I know a regular winder won't wind a Kinetic movement because a very fast rotation is necessary to charge the capacitor, but doesn't a Spring Drive just have a normal mainspring?

 

Very impressive, smoked the Seiko specs for the watch.

 

That's all against what I've heard. Maybe the next time the Grand Seiko roadshow is in Texas I'll stop by and ask.

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Day 20, 1 second fast. The last week was a mix of wrist and winder.

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Day 20, 1 second fast. The last week was a mix of wrist and winder.

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Great results, thank you for taking the time to share your testing with us.

 

Cool stuff. Thanks for sharing.

 

Love the Spring Drive more and more as I learn more about it. That smooth sweeping seconds hand and accuracy is second to none. Looks like the Marine Master 600m tuna can has stolen my heart. It will be a while, however I'm really really looking forward to it.

 

I've decided as I count down to a month of monitoring to check for isochronism issues by letting the watch run down 2 days and then wearing .

I seriously doubt I'll find any as I figure the engineers checked to make sure the main spring had enough torque to keep the train spinning at 8 revs at all points of wind. Worth a look though since I'm just playing anyway.

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So it's been a month since I've been paying attention.

Just checked, watch is 1.5 seconds fast. This is 0.05 seconds per day.

Hard to know if that beats cosc since I don't keep the watch in that much heat but pretty impressive.

Seems like the watch gained about a second over the last week. I was letting the watch run almost dead before winding. Maybe there is a touch of isochronism after all.

Other watches I put on the winder while I was paying attention: Damasko db2, +4.5/day.
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