I'm coming to the conclusion that when Geoge Daniels designed his Co-axial escapement to challenge the stability and accuracy of the quartz wristwatch, and sustain public affection for the mechanical wristwatch he certainly succeeded - in my case at least.
I've had my Aqua Terra for three months now, and at the end of February, as I unscrewed the crown to advance the date, I realised that this was the first time I'd had to unscrew the crown since owning the watch. The time was still pretty much spot-on. As I type today, the watch is just one second fast after having been running for over three months (and I've not had need to re-set it during that time). During this time, the watch has never been more than a few seconds adrift, and I've not done anything special with it - I've just put it on in the morning and taken it off at night (and not worn it when I've been servicing my motorcycle).
I've had a few (too many!) mechanical wristwatches over the years, and many of them have been good timekeepers, but this particular example of Omega's 2500C movement is just outstanding. None of the quartz wristwatches I own are as good timekeepers as this - a fact which I find quite astounding.
Regards,
Michael
i've never really timed my Railmaster, but its probably 3-4 secs a day fast, still very good, but not as good as yours. i wear my watches for 2-3 days at a time and then change it.
so far my most accurate watch is a King Seiko from 1964 which i adjusted myself to 1 sec fast every 3 days. it was a total fluke as it was running a bit fast so i moved the regulator a bit and hey presto!
generally the co-axials are well within COSC standards and i think they'll fair well when the new COSC rules come in this year.
best
Graham
Bill,
I used to really covet the red gold de Ville Co-Axial... I remember admiring it in a dealer's window when I was saving up the cash for the ruthenium dialled stainless version - a watch which I still have and cherish, though it is also a sad reminder: I bought it here in the UK on 11th September 2001, and it was only when I returned home from buying it Stratford on Avon that I heard the shocking news of that day.
Michael
I have two COSC Co axial Omega's and they are the most accurate of all my watches. I did have the teething problem on a Cal 3603, where it had stopped twice during two weeks. However off to mediation and it was back in 6 weeks. Has been on a winder since if not being worn. Interestingly enough this one is much more accurate when being worn then sitting on a winder.
The second one being a recently aquired Cal 2500C with out issue and very good timekeeping.
I keep my three automatic watches continuously wound on my winder. Each of the three (one a Valjoux 7750 with "Chronometre" finish; one a Glashutte Original Caliber 100 and one the Omega Coaxial 2500c) demonstrates slightly different traits if I just leave it on the winder versus wear it on a daily basis.
The Glashutte (which I recently got back from Germany, where it was overhauled) was measured in Germany at +5 per day (within COSC specs though the Germans don't certify with the Swiss). Generally speaking, I've found it to be almost perfectly accurate on the winder and about +10 seconds a week, with use of about 3-4 days a week.
The Valjox 7750 is the most stable of the bunch and doesn't care what I do with it. Heck, some times I feel I can throw that piece against a brick wall and it would keep ticking. What a durable movement. Anyway, it tends to come in at about +2 a day.
The Omega is a solid -1 second a day. Regardless of where used (in the pool, on the beach, in the office, or on the winder).
So I own three great movements, but the Omega is phenomenal. Over time, it may prove to be the most accurate.