What’s you most accurate non-COSC watch?

I was happy to find my Batic Aquascaphe had a little printout in the box that it had been regulated to +2 seconds/day a couple of weeks before I bought it. Nice to see.

My 556I RS is about + 5 sec, love it 😍

I love what they’re able to do with Miyota. My old Lorier falcon was like +3.

My Christopher Ward C63 runs from 0 to 1 second a day when tested Face down.

Hardest decision I’ve ever had to make was RS or no RS lol

My Orient is about minus two a day on wrist, plus six off wrist face up, so it balances out nicely. My Pagani with an NH35 is also minus two if I recall. Didn’t look at it in different positions though.

Agreed. My Laco Augsburg is plus 7 per day - which is only one out from Cosc, and perfectly acceptable at that price point.

As for other non-Cosc watches: my Mark XX - which is not entry level by any means - is also non-Cosc, but it's plus 1 spd in the box, minus 2 spd on the wrist, which makes it my most accurate automatic. But IWC can vary wildly, so make sure you test in the boutique with an app if you're ever thinking of getting one. (I wrote a post about it.)

Hamilton Khaki Field Mechanical (bronze), has been running at -0.5s per day for the past year ✨

Longines Hydroconquest +3 and Hanhart Pioneer One +4

My spb147 is about + 2/3 seconds a day consistently over the last two years. I have heard how bad these movements are but I’ve had this an alpineist and two captain Willard’s all have been close to this but this spb147 is the best

My 556 is usually close to that too 👍

I wore my speedmaster 1861 for just over 3 months day and night only taking off for winding daily and showering last year and it was only 80 seconds fast after almost. 100 days

I know its not a cheaper non cosc watch but I was very impressed with that

+/- 0 seconds per infinity

My most accurate, to my knowledge, is my 25 year old Tutima Pacific which is only a couple seconds fast/day. Others might be close but I rarely check. I'll guess most og my autos/mechanicals are between a couple to 20 seconds/ day.

Fine by me.

My Lorier Hydra S3 works pretty damn well. Has the Miyota 9075 in it. From what I’ve seen it gains + 3 to + 5 seconds per day. Pretty impressive for the price point. Goes to show today a COSC certification isn’t necessary

I had a similar experience with a Hamilton Pilot Pioneer, was bang on

My Hamilton Chronograph H is currently +1 every day or so. But I get it regulated every six to ten months. That is only to make it gain time rather then lose time. When it loses time more often then gain it’s +/-3 which is still great!

Tandorio, titanium, Pt5000 regulated at home whith my phone. I am just a enthusiast, amateur wannabe watchmaker, my eyes are not sharp and my hands are not steady; but for every problem you cand find a tool.

And i have to be onest and say that are positional variations and the mainspring is not swissquality isochronous so i have -1 -2 s/d error.

And i am sure that the errors will increase in time

If i have to say what is the price for regulating a watch at minimal error i say that is one day paychech for a high trained professional plus 30% malpraxis assurance; 300-1000 USD

I know 😅

I have similar results with Chinese ST3600 movement. I regulated it myself when I built the watch. But in my version of the app I do not get the amplitude. Is there a setting to show the amplitude?

Probably the experimental mode, i am not sure

😆

My Orient Kamasu runs +1 second/day. My GS with the newer Spring Drive runs +2 seconds/month. Most of my watches are within COSC spec even without the actual certification.

I feel you 😂

Here’s one of my most accurate watches the IWC Aquatimer Chronograph Sharks 🦈

4 Seiko 6R35 movements that are accurate - you must be one really lucky person! 😀

You and I have the same taste in watches.. Sinn - Dead Nuts, Seiko +2

Great taste you have there sir

I did have a 556a too so identical lol

I don't have the ability to rigorously measure these things, but my recently purchased Smiths Everest has kept effectively perfect time, so far.

I’d love to learn how to do this. I’m terrified to open a watch up.

You beat me to it.

I buyed two cheap Chinese watches for training, 90USD each because i wanted 28800bph; whith nh35 clones the price is 50-60usd.

Next step:learn the app Watch Accuracy Meter or buy a timegrapher and learn to use it.

Next step: collecting data to understand your watch, use tabels for 6 positions and repeat measurements.

Full wind the watch and measure power reserve.

Full wind the watch, wait 30 min and write a table for errors in 6 positions, repeate the 6 positions table for 80% power reserve, for 50%power reserve and 20%power reserve.

Chech the watch for errors comparative whith the phone daily, in at least two scenarios: the watch weared 10 hours daily and the watch weared 24h/24

I left the temperature variations aside.

After that, take all the data, studu and try to see what is the minimal error that fit your habits, and make a decision: open the watch case or not?

I learn how to avoid some material mistakes just after i did them, it is a learning curve whith cost associated. If you can afford good tools you can take less time but you pay anyway, you pay money or time.

For me it is just a hobby.

And YouTube has a lot to offer, i mention just Wristwatch revivel and Chronoglide.