I have two Rolexes and both of them run <1 sec even after 2 weeks of consecutive wear (better than my Sinn UX!!). A SD4000 and an ExpII. My PO also runs at about -0.25spd, and my SOH runs at about +1/week. I'm very very happy with all 4 of these.

My worst so far was a Sinn U2 that needed service, which was running at +25spd.

 

A the moment my Rainer Neinaber is the best regulated and my Aviator isn't.

 

My Seiko usually loses about 6 seconds per year. Only 5 seconds this year though because a leap second was added. Leap Second - What is it?

Least accurate? where do I start? I have had, and have a heap of mechanical watches and they are all over the place. They are all accurate enough to wear for a day without resetting so I don't mind and I don't bother to measure their accuracy.

 

Seiko Presage 100 year LE + JLC Compressor Auto (after service) were most inaccurate. Spring drives are of course the most accurate.

 

I have this regulated to the point it almost keeps perfect time, maybe +/- 1 sec./day.

I've got this one down to about +15 sec./day, but out of the box it gained more than a minute in 12 hours!

There's definitely some "you get what you pay for" going on here!

 

Perfection.............

 

Most accurate overall? The Seiko Kinetic Perpetual Calendar, but that's quartz, so it should be. It does something like +4 sec/month iirc.
Most accurate mech? Lew & Huey Acionna at ~+2 sec/day.
Least accurate mech? The Getat 6497 at ~+15 sec/day

 

My Rolex submariner is the most accurate automatic I have owned. It is +/- 0 spd.

 

My Aegir CD-2 with a Soprod A10 movement. Perhaps a coincidence, but I wore it constantly on a three week trip and recorded it at +/- 0.0 seconds for the duration. It was the "constant" to four others I was checking that were on a winder and it was the best of all - including two COSCs.

 

This is great to hear since I'm currently seriously considering a Steinhart Ocean 1 Premium which uses that movement. So far I've heard very good things about it and Steinhart minus some complaints on other forums from more experienced collectors complaining about newbies going on and on about Steinhart as if they're as if they're as good as a Rolex or something (my general understanding is that they're simply better than most other watches in the same price range, that's it, that is they're very good value for money).

 

I just tested my Benarus Vintage Moray 44mm over the past 36 hours and it ended up spot on. Was a little slow last night when I took it off (1-2 seconds) but caught up overnight. Surprised by the accuracy of the Miyota 9015 movement.

 

The watches are in my signature... You'll figure it out BTW, the GS is a quartz, so the -0.2 s/d is really just a measurement error:

 

Most: Speedmaster 9300

Least: Swatch Sistem 51

 

Most: My Citizen Perpetual Chrono AT
Least: My Orient Black Ray
Of course, one is a radio controlled quartz and the other is automatic. I like both watches equally that's why I own them.

 

Rolex, Patek and Omega are the most accurate in my experience.

 

My GS SBGA105 Spring Drive gained 3 secs over 8 months. Yes, 8 months.

My VC Overseas Auto gained 1 sec over the last 3 days.

Dunno about least accurate.

 

While not high end at all, surprisingly, it was my Orient blue Ray. It was an astonishing rate before I dropped it...uh, probably like 1 second every few days if I wore it during the day and then laid it dial up at night. After dropping it about 1 foot onto hardwood floors, landing dial down, it was +5 per day. Not bad, but I was distraught and decided to regulate it. I now have it to within about 1 second every two days. It was tedious to get it there, and who knows if it will STAY that way, but I'm happy for now...

Least accurate was an Orange Monster out of the box, at -17-20 a day. That got regulated too.

 

My Pelagos with 2824 is my most accurate at average +2.4 spd, closely followed by my TAG with Calibre 5 at average +2.6 spd.

Worst I ever owned that wasn't broken or magnetized was a Vostok Komandirskie which was +30spd

 

My Ananta Spring Drive is +6 seconds over 2 months.
My least accurate is a 1972 Seiko 7019 that gains +4 MINUTES per day (I don't wear that one ever)
My Credor is rated to +-10sec/yr, but without a seconds hand I can only assume that it's perfect.

 

My Tissot Ballade III used to be my least accurate watch. When I bought it last year, it was about +15 spd. After having it for a bit over a year, it is now my most accurate at about +0.5 spd. Who knows if it just broke in or will be -15 next year, but for now, I like the accuracy.

 

Casio GS-1200B-1AJF is the most accurate I have had.

Takes a synch signal from Ft. Collins Colorado every day at 0200 and even sets correctly for DST.

Least accurate was an old Timex Indiglo

 

My Bell & Ross BR01-96 will lose about two seconds a day. Very close to my Rolex Datejust. My Hamilton Jazzmaster will gain about 8-10 seconds per day.


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Most accurate is my Seiko Tuna 7c46. Quartz accuracy, at about +5 seconds a month. My least accurate is my vintage Seiko 6138-3002. The reason is because it's never been (or poorly) serviced, and I tried to regulate it myself. Any fine adjustment bumped the watch a minute fast or a minute slow per day. So I'd rather it be fast. And yes, I've regulated other watches, including my Speedmaster, before with good results. I believe this movement just needs servicing. Seeing as though I rarely wear the same watch for more than 24 hours, I don't really care about it's accuracy.

 

I'll show you:
Most accurate, plus about 1/2 second a day.

And, least accurate;

The movement regulator is so touchy that even my watchmaker can't do anything with it.
So, gave the red Seiko to my young nephew.

 

Least accurate was a MIL issue plastic cased Benrus that struggled to be within 7-8 minutes/day (poor thing finally drowned in Vietnam).

Most accurate was a surprise: $35 stainless/saphire field watch with looks based on some of those Vietnam era field watches. "Ram" brand with a Miyota quartz movement. Gains a couple seconds every 6 months.

No pic of the old Benrus, but here's the Ram: