How accurate is your Omega?

Serviced Feb last year,it’s a few seconds a day slow.

What do you use to time your watches? Do you use a internet resource or an atomic clock?

My green Seamaster is perfect. Hour and minute hands and bezel insert are perfectly aligned, date change occurs precisely at midnight, bezel and crowns operate smoothy. Timed it from Dec 31 to yesterday: +3.8 spd. That's just an observational accuracy which is what really counts, after all, since a wristwatch that requires observation to use I use the WatchCheck app and my phone network NTP time. Very happy with my purchase.

Mine is pretty accurate.

Exactly my friend, my green seamaster is extremely accurate too, what a special watch it is! I have never had a mechanical watch as accurate.

It's only been a few days since I got my watch (Geneve Dynamic 166.0079, caliber 752) back from service, but when I got home from the shop it was 6 seconds ahead of my laptop (this is not incredibly precise measuring, just holding the watch up to the clock in the menu bar and gauging the difference when the hands hit certain places). The timegrapher printout said that the watch gains 5.2 seconds/day in the dial up position, so I left it like that overnight when I was sleeping, and in the morning it was 10 seconds ahead of my laptop. Wore it normally all day, and it was still 10 seconds ahead. The timegrapher said in the crown up position it would lose 8.5 seconds/day, so I left it in that position overnight last night, and this morning it was still right at 10 seconds ahead, and it's been like that all day as I've worn it. I haven't yet manually wound the watch, so I don't know how much the mainspring has released (it was fully wound when I left the shop on Tuesday evening). I walk about a couple miles per day all told and spend most of the rest of the time at a desk, so not sure if that's enough activity to keep it fully wound. But if it stays this precise on average I'm going to be ecstatic. The average timegrapher result was -.7 seconds/day.

Just for yucks and grins after the new year I decided to start tracking (again, imprecisely) how my watch compared to my laptop clock. It had come back from its first trip to service just before the new year, and from the time period of 1/12-1/18, it was losing around 7 seconds/day. Lots better than the +20 seconds/day it was gaining prior to service, but also not as good as the average -2.8 seconds/day I had been given on the timegrapher printout from that first service. On 1/18 I sent it back because the second hand was intermittently stopping, and again it's only been a couple of days since I got it back but things are much better so far.