Need help Have some question after serviced by Omega

Omega doesn't service these to modern chronometer standards, and in fact the timing tolerances for all the 550 and 560 series watches are the same. This is why the watch has only been checked over 3 positions instead of 5 as a typical chronometer would be.

So the tolerances for average daily rate require that it fall between -1 and +16 seconds per day. The Delta at full wind (difference between fastest and slowest positions) should be no more than 25 seconds, and at 24 hours after full wind it should be no more than 35 seconds.

So based on the timing slip, your watch falls within Omega specs for the Delta...barely. It easily meets the spec for average daily rate.

The balance amplitudes on these are typically not as high as you would see on a modern ETA based watch for example, so 260 isn't spectacular, but it's not bad. There's no adjustment for the amplitude - it can only be improved by going through the movement in a very meticulous way and reducing sources of friction. Note that the friction spring adjustment for the sweep seconds pinion can make a big impact on amplitude if it's not adjusted correctly. Omega doesn't have a specification for amplitude at full wind, but they do require on this movement that no position tested should drop below 160 degrees 24 hours after full wind.

So can all this be improved? Yes very likely, but if it's within tolerances Omega (or really any other brand service center) isn't going to keep trying to make it better. Once it meets the tolerances, it's done in their eyes. I get much better results on these calibers all the time, so it's a matter of picking the right place to send your watch...

Cheers, Al