I will freely admit that when it comes to the power reserve on my C63 GMT I haven’t a clue. On a two week trip to Greece recently, for example, it was the only watch I took so it never stopped. I was out walking every morning so I suppose that by lunchtime it would have been in a full state of wind. I was swimming with this watch, as well as wearing it in bed, so it was only off my wrist for a few minutes on any day, when I had a hot shower. I had worn it practically the whole summer, so I don’t think it actually stopped between early July and late September. I probably reset it every week or so, but obviously there was no need to wind it. It is now having a sleep but I can’t remember when I put it back in the box.

I tend to wear any watch these days from between four or five days to a couple of weeks or more, then they go into the box for a while. I don’t have a rotation as such, but rather I wear any particular watch for as long as I feel like it. So the stated power reserve is really of little interest to me.

The only one I have tested recently is the SH21 on my C9 SS. I did that when I first got the watch (easy because it is hand wound) and it ran for 131 hours. I haven’t bothered again.

Update: Entered week nine as of this past Thursday, October 27. I have been emailing with CW customer service and my C63 GMT is scheduled to ship this week. Once received, I'll test the power reserve and report back on this thread.

Just received my C63 GMT from DHL. Total time at CW ended up being nine weeks, total time away was 10 weeks. I have fully handwound the movement and will see if it lasts 56 hours. I'm not sure, but I think it took somewhat longer to handwind until I heard the clicking of the clutch compared to before (or compared to my other watches with the older ETA 2893/SW330-1). Perhaps a batch of CW SW330-2 movements mistakenly had the older barrel spring? There was no explanation of diagnosis or work done, so this is pure conjecture on my part. Stay tuned.

Bident wrote: ↑Tue Nov 08, 2022 2:01 am Just received my C63 GMT from DHL. Total time at CW ended up being nine weeks, total time away was 10 weeks. I have fully handwound the movement and will see if it lasts 56 hours. I'm not sure, but I think it took somewhat longer to handwind until I heard the clicking of the clutch compared to before (or compared to my other watches with the older ETA 2893/SW330-1). Perhaps a batch of CW SW330-2 movements mistakenly had the older barrel spring? There was no explanation of diagnosis or work done, so this is pure conjecture on my part. Stay tuned.
IMG_2941.jpeg

It could be. It is my understanding that the mod is a barrel with a thinner wall to accommodate a longer spring. The datasheets show the same spec for winding for both the SW330-1 and SW330-2 though (65 crown turns/1000 rotor turns).

rkovars wrote: ↑Tue Nov 08, 2022 4:51 pm

Bident wrote: ↑Tue Nov 08, 2022 2:01 am Just received my C63 GMT from DHL. Total time at CW ended up being nine weeks, total time away was 10 weeks. I have fully handwound the movement and will see if it lasts 56 hours. I'm not sure, but I think it took somewhat longer to handwind until I heard the clicking of the clutch compared to before (or compared to my other watches with the older ETA 2893/SW330-1). Perhaps a batch of CW SW330-2 movements mistakenly had the older barrel spring? There was no explanation of diagnosis or work done, so this is pure conjecture on my part. Stay tuned.
IMG_2941.jpeg

It could be. It is my understanding that the mod is a barrel with a thinner wall to accommodate a longer spring. The datasheets show the same spec for winding for both the SW330-1 and SW330-2 though (65 crown turns/1000 rotor turns).

That’s interesting regarding the datasheets’ winding. I just hand wound my Steinhart which has the ETA 2893 and it only took approximately 40 winds before the clutch clicking sound began. Granted, my “wind” may be different than how the manufacturers define the term based on what a standard rotation might be, but assuming my winding is consistent, I think the C63 GMT required more than 40 turns. But I’m not entirely sure.

I did email CW last night to ask what was done to the watch, and they replied this morning saying the entire movement was replaced. My watch not only didn’t meet the 56 hour power reserve but also kept decreasing in reserve (48 hours went to 40 hours), so maybe I had other issues besides the barrel spring.

If the watch lasts 56 hours it should stop around midnight, Pacific Standard Time, on November 10. I’ll post the results when the time comes.

Bident wrote: ↑Tue Nov 08, 2022 5:13 pm

rkovars wrote: ↑Tue Nov 08, 2022 4:51 pm

Bident wrote: ↑Tue Nov 08, 2022 2:01 am Just received my C63 GMT from DHL. Total time at CW ended up being nine weeks, total time away was 10 weeks. I have fully handwound the movement and will see if it lasts 56 hours. I'm not sure, but I think it took somewhat longer to handwind until I heard the clicking of the clutch compared to before (or compared to my other watches with the older ETA 2893/SW330-1). Perhaps a batch of CW SW330-2 movements mistakenly had the older barrel spring? There was no explanation of diagnosis or work done, so this is pure conjecture on my part. Stay tuned.
IMG_2941.jpeg

It could be. It is my understanding that the mod is a barrel with a thinner wall to accommodate a longer spring. The datasheets show the same spec for winding for both the SW330-1 and SW330-2 though (65 crown turns/1000 rotor turns).

That’s interesting regarding the datasheets’ winding. I just hand wound my Steinhart which has the ETA 2893 and it only took approximately 40 winds before the clutch clicking sound began. Granted, my “wind” may be different than how the manufacturers define the term based on what a standard rotation might be, but assuming my winding is consistent, I think the C63 GMT required more than 40 turns. But I’m not entirely sure.

I did email CW last night to ask what was done to the watch, and they replied this morning saying the entire movement was replaced. My watch not only didn’t meet the 56 hour power reserve but also kept decreasing in reserve (48 hours went to 40 hours), so maybe I had other issues besides the barrel spring.

If the watch lasts 56 hours it should stop around midnight, Pacific Standard Time, on November 10. I’ll post the results when the time comes.

That is interesting and good to know. A fresh movement is a pretty good result I think. Sounds like something was definitely out of whack. I have read somewhere that the 2893 is 30 complete turns of the crown but I can't find a definitive answer in ETAs documentation (the datasheets are not as good as Sellita). I am sure that the manufacturers hook them up to a machine to get 1 compete revolution that is consistent. When we wind sometimes we are less than 1 and sometimes more I think. It should average out a bit.

rkovars wrote: ↑Tue Nov 08, 2022 5:34 pm

Bident wrote: ↑Tue Nov 08, 2022 5:13 pm

rkovars wrote: ↑Tue Nov 08, 2022 4:51 pm

It could be. It is my understanding that the mod is a barrel with a thinner wall to accommodate a longer spring. The datasheets show the same spec for winding for both the SW330-1 and SW330-2 though (65 crown turns/1000 rotor turns).

That’s interesting regarding the datasheets’ winding. I just hand wound my Steinhart which has the ETA 2893 and it only took approximately 40 winds before the clutch clicking sound began. Granted, my “wind” may be different than how the manufacturers define the term based on what a standard rotation might be, but assuming my winding is consistent, I think the C63 GMT required more than 40 turns. But I’m not entirely sure.

I did email CW last night to ask what was done to the watch, and they replied this morning saying the entire movement was replaced. My watch not only didn’t meet the 56 hour power reserve but also kept decreasing in reserve (48 hours went to 40 hours), so maybe I had other issues besides the barrel spring.

If the watch lasts 56 hours it should stop around midnight, Pacific Standard Time, on November 10. I’ll post the results when the time comes.

That is interesting and good to know. A fresh movement is a pretty good result I think. Sounds like something was definitely out of whack. I have read somewhere that the 2893 is 30 complete turns of the crown but I can't find a definitive answer in ETAs documentation (the datasheets are not as good as Sellita). I am sure that the manufacturers hook them up to a machine to get 1 compete revolution that is consistent. When we wind sometimes we are less than 1 and sometimes more I think. It should average out a bit.

My Glycine Airman is still running, but once it runs out of power, I’ll give it a full wind to see how many rotations it takes before the clutch clicking starts. That’s the only other SW330 I have in the herd.

54.5 hours is the result of my test, a bit short but good enough for me. Hopefully it won’t deteriorate from here like the prior movement.

Bident wrote: ↑Thu Nov 10, 2022 4:54 pm 54.5 hours is the result of my test, a bit short but good enough for me. Hopefully it won’t deteriorate from here like the prior movement.

Remember that per the spec it is 56 typ/50 min. I don't think there is any reason to think it wouldn't hold there. Definitely way better than the old one.

Good to hear it's now performing well John

rkovars wrote: ↑Thu Nov 10, 2022 4:58 pm

Bident wrote: ↑Thu Nov 10, 2022 4:54 pm 54.5 hours is the result of my test, a bit short but good enough for me. Hopefully it won’t deteriorate from here like the prior movement.

Remember that per the spec it is 56 typ/50 min. I don't think there is any reason to think it wouldn't hold there. Definitely way better than the old one.

For sure! Also, my Glycine Airman with the SW330-1 took 46 winds before the clutch clicked, and the C63 GMT took 57 winds. Seems to make sense.

Bident wrote: ↑Thu Nov 10, 2022 6:00 pm

rkovars wrote: ↑Thu Nov 10, 2022 4:58 pm

Bident wrote: ↑Thu Nov 10, 2022 4:54 pm 54.5 hours is the result of my test, a bit short but good enough for me. Hopefully it won’t deteriorate from here like the prior movement.

Remember that per the spec it is 56 typ/50 min. I don't think there is any reason to think it wouldn't hold there. Definitely way better than the old one.

For sure! Also, my Glycine Airman with the SW330-1 took 46 winds before the clutch clicked, and the C63 GMT took 57 winds. Seems to make sense.

Seems about right. As an interesting aside, I think that the mods are backwards compatible. I wonder if they will upgrade the Glycine during a service. I would think that they would.

rkovars wrote: ↑Thu Nov 10, 2022 7:29 pm

Bident wrote: ↑Thu Nov 10, 2022 6:00 pm

rkovars wrote: ↑Thu Nov 10, 2022 4:58 pm

Remember that per the spec it is 56 typ/50 min. I don't think there is any reason to think it wouldn't hold there. Definitely way better than the old one.

For sure! Also, my Glycine Airman with the SW330-1 took 46 winds before the clutch clicked, and the C63 GMT took 57 winds. Seems to make sense.

Seems about right. As an interesting aside, I think that the mods are backwards compatible. I wonder if they will upgrade the Glycine during a service. I would think that they would.

Perhaps, but they would probably charge a fee to upgrade I imagine, and my Glycine gets about 50 hours already. When the SW330-2 and SW300-2 first came out, I remember Orion Watches offered to swap the barrel spring for any customers who purchased a watch with the SW300 used in their Calamity dive watch, but I think there was a fee to do it. I also remember Nick of Orion Watches saying he tested the mod and his watches lasted over 60 hours.

Bident wrote: ↑Thu Nov 10, 2022 7:44 pm

rkovars wrote: ↑Thu Nov 10, 2022 7:29 pm

Bident wrote: ↑Thu Nov 10, 2022 6:00 pm

For sure! Also, my Glycine Airman with the SW330-1 took 46 winds before the clutch clicked, and the C63 GMT took 57 winds. Seems to make sense.

Seems about right. As an interesting aside, I think that the mods are backwards compatible. I wonder if they will upgrade the Glycine during a service. I would think that they would.

Perhaps, but they would probably charge a fee to upgrade I imagine, and my Glycine gets about 50 hours already. When the SW330-2 and SW300-2 first came out, I remember Orion Watches offered to swap the barrel spring for any customers who purchased a watch with the SW300 used in their Calamity dive watch, but I think there was a fee to do it. I also remember Nick of Orion Watches saying he tested the mod and his watches lasted over 60 hours.

I wouldn't count on there being an extra charge. I can see them charging for a straight up mod but during a service it would be covered in the service cost. Maybe just a bit extra for the parts which wouldn't be much.

ajax87 wrote: ↑Fri Jul 29, 2022 3:49 am I started my test on 7/26 at 10:30pm, and found mine stopped at 6pm 7/28. Only 43.5 hours!

I had worn it the 2 previous days. Kept on winder before that. Not sure if it was fully wound.

I just gave it 80-90 winds, till I started hearing the click indicating it’s fully wound. Will give it another go.

Thread resurrection !!

When I got my C65 Aquitaine GMT the other day, I wound it 40 winds and set the time and left it in the watch in the watch box to test the power reserve. I did this on Thursday and I checked it Saturday morning and it had stopped which was at only 41 hours.
If I fully wind a watch I generally give it 40 winds but I kept winding it till I heard the clutch slip and that was at 80 winds.
So this makes a lot of sense as there is a bigger mainspring giving a bigger power reserve so obviously needs more winding.
I figure it should get to the 56 hours or close enough when I try it again on Tuesday morning