mac_omega
1375
I think it might...
Hi,
I think Cal. 861 as well as Cal 321 are among the most accurate chronograph movements I ever owned!
I have both of them and both are running within a range of about 3-4 seconds a day - so I do adjustment of time only once a week 
You just have to be patient when regulating/adjusting the movement and you might achieve similar results.
Just my experience
Erich
Moon Watch accuracy!
I bought twelve years old Speedmaster Moon Watch Caliber1861, recently. It is in perfect condition. It was loosing exactly 1 minute a day, although it is difficult to say as it doesn't have hacking seconds hand. I had it serviced by good independent watch...
Depends of several factors
Here is my cents. I'm sure that a more experienced person can offer a more solid advise. The Moon Watch movement, 861/1861 etc. cannot be called a chronometer (or being COSC certified) because, IMHO, is a movement that is designed for sturdiness and depen...
I think it might...
Hi, I think Cal. 861 as well as Cal 321 are among the most accurate chronograph movements I ever owned! I have both of them and both are running within a range of about 3-4 seconds a day - so I do adjustment of time only once a week You just have to be pa...
hi and welcome to the forum. you'll get the answer you need here
firstly accuracy is quite often different for different people due to the type of movement and positioning of your wrist during the day, but 20 secs is not acceptable for me. i have 3 very vintage 321 calibres and 1 1861 calibre all of which are accurate ...
Case opening?
Thank you very much Graham! I think the only way for me to make gradual adjustments would be to do it myself, as you suggested, or I would need to make frequent trips to the watchmaker. So, the next question is, how do you open the case; what tool do you ...
if you look on ebay...
if you look on ebay you'll see 1000's of caseback openers for sale. you dont need an expensive one, just an adjustable one like mine in the attached pic. make sure you adjust it well so it doesnt slip and scratch the back, but these are far better than th...
Thanks!
Thank you again. I will let you know how I get on with it when i get the tool. I also realized that I need something for removing the bracelet too. Dragan
a small precision screwdriver will...
a small precision screwdriver will do that as you only need to pull the end of the spring bar down. G
Within a couple of seconds per day ...
... is certainly achievable. Do you know about the service history of your watch? If you are consistently fast (by the same amount each day) then simple regulation is all that is required. I have an 11 year old Ref. 3572.50 (hesalite-sapphire sandwich) wi...
Much appreciated!
First of all, thank you all for your helpful contribution. Everything mentioned makes sense and I will certainly try to regulate the precision of this lovely watch. Someone mentioned the service history, and that could be the problem, as from new, meaning...
Also have one from about that same age...
Considering that I have a watchmaker who have been able to get all my vintage Omegas running well within COSC specs, I suppose I need to time mine. Will report back in 24 hours. Have never had this serviced or regulated since acquiring preowned about 4 ye...
Don´t send it to Omega,.it will...
Hi, I recommend that you don´t send it to Omega, it will cost you a leg and an arm! Every good watchmaker will be able to do the regulating for a fraction of the amount which Omega will take from you. It is better to buy another watch with this money...
3.5 sec/day
That's what my 1967 321 does - far better than I'd expected it to as they were never chronometers. My 1966 Seamaster 300 managed +/- 0 sec/day at the last count - and not even COSC Yes your Speedie should do/could do better Cheers Andrew