What’s your most accurate mechanical watch?
Hey everyone! I used to not pay too much attention to the accuracy of my mechanical watches, but after receiving this Hydroconquest with the new Longines L888.5 with silicon balance and 72 hr power reserve, I started testing its accuracy after its break-in period. So far, I’ve set it three days ago and it’s currently .5 seconds slow. Over these past few days, I’ve noticed it deviate no more than 2 seconds, but averages out to be almost dead on the money. I know that the L888.5 is the L888.4 without the COSC cert, but it’s well within COSC spec. Now, I did reach out to about 20 other Hydroconquest owners, and they all back up my findings. All L888 owners stated they were running about 2 seconds a day, max… seems like Longines is getting even more serious about accuracy (and quality) lately. What’s your most accurate mechanical watch? I wanna know! Let’s see those pics!
Shane Paradis. I’m a string instrument repair technician, and cat dad 😄 I’m here for the fun and fellowship.
My Tudor BB GMT is incredible so far. I've been super impressed
My Omega Seamaster 300M is super accurate. After almost 2 years of ownership it's literally at 0 spd. Very impressed.
My IWC Mark XV, it’s about 1 second fast per week!
I have other COSC movements but this is honestly my most accurate. Flygraf with Yema 2000 about 1.5yr old. supposed to stay +\- 10sec per day but it stays about +0.4-1 per day which is crazy.
My IWC Mark XV, it’s about 1 second fast per week!
That’s insane! IWC is an amazing brand.
Your Longines accuracy is super impressive.
Most of my watches run within COSC specs, but I have a couple that really stand out. My GMT Master (116710LN) has never gained more than 1 to 2 seconds per week, so it would be my most accurate. Second would be my Hamilton Khaki Pilot (H647150) with an ETA 2836-2 movement which typically gains just under 1SPD. I also have a Norqain Adventure Sport Chrono which recently has been running just over +1SPD, however it had originally been running at around +7SPD, and I can't explain why it would have changed. All of those are based on actual "on the wrist" timings and not on a TimeGrapher. I wear my watches while sleeping, and whenever I change watches, I set to a precise reference time and monitor them for accuracy.
On a side note, I picked up an Omega X-33 Skywalker quartz watch earlier this year, and set the PE1 timer when I bought it. That PE1 time currently shows as having been running for over 81 days, and the watch is still only 1 second off from the atomic reference time I use for setting my watches. At that rate, it works out to an accuracy of 5 seconds per year, making it my most accurate quartz watch.
Your Longines accuracy is super impressive.
Most of my watches run within COSC specs, but I have a couple that really stand out. My GMT Master (116710LN) has never gained more than 1 to 2 seconds per week, so it would be my most accurate. Second would be my Hamilton Khaki Pilot (H647150) with an ETA 2836-2 movement which typically gains just under 1SPD. I also have a Norqain Adventure Sport Chrono which recently has been running just over +1SPD, however it had originally been running at around +7SPD, and I can't explain why it would have changed. All of those are based on actual "on the wrist" timings and not on a TimeGrapher. I wear my watches while sleeping, and whenever I change watches, I set to a precise reference time and monitor them for accuracy.
On a side note, I picked up an Omega X-33 Skywalker quartz watch earlier this year, and set the PE1 timer when I bought it. That PE1 time currently shows as having been running for over 81 days, and the watch is still only 1 second off from the atomic reference time I use for setting my watches. At that rate, it works out to an accuracy of 5 seconds per year, making it my most accurate quartz watch.
That’s mind blowing! I recently gave my friend a Seastar with the new Precidrive movement that is rated at 10 spy. I’ve had a few TC quartz watches that were around 10 spy but 5 is a whole other ball park
My GS Winter is accurate within 0.2 seconds/day
Another IWC - my mk xvi gains less than a second a day - over a long time too!
That’s mind blowing! I recently gave my friend a Seastar with the new Precidrive movement that is rated at 10 spy. I’ve had a few TC quartz watches that were around 10 spy but 5 is a whole other ball park
I suspect that the actually accuracy is probably somewhere between 5-10 SPY. Reaction time when initially setting the watch, along with interpolating differences under 1 second, may be introducing some errors. It's my understanding that Omega rates the 5619 thermally compensated quartz movement to be accurate to +/- 10SPY. Even at 10SPY, it's pretty darn impressive.
Purchased in 2005 my Jeager LeCoultre Master Control Hometime is the most accurate watch in my collection my Rolex Day Date is a close second.
Not including my GS spring drive Skyflake (which has gained 2 second in 1.5 years) my Tudor BBB (43mm heritage) is insanely accuracy. I think it’s gained 2 seconds in the year that Ive owned it.
Interestingly enough, these two, so very different from each other:
The L888.4 in the Spirit is a great movement, but the cal.562 in the ca.1960 Seamaster, despite the massive gap between it and the L888.4 in terms of materials and technical solutions, performs outstandingly - roughly +4/+5 seconds per day on average.
Tudor BB 41
Cartier Santos. Keeping near perfect time.
Sounds kinda goofy, but my Orient Kamasu runs about +2 seconds day. Go figure?
My Tudor BB Heritage 41mm is a 1 second a day watch. Hard to complain about that.
3235 movement doesn’t disappoint.
That is unexpected! but what a little treasure!
3861 Speedmaster
3235 movement doesn’t disappoint.
Thats a grail piece! I love seeing the performance of Rolex movements
My Invicta 1953 or Panerai PAM 372. The Invicta averages about +2 - 0 per day, and the Panerai, though with no second hand, appears to gain a minute per month or so.
Grand Seiko SBGA463 is the best. My Rolex Explorer II (20 plus years old) and Omega Seamaster are both in COSC tolerances