I recently bought a Speedmaster 3861 Sapphire Sandwich. I looked at the METAS results (which I attach here). The average daily precision was measured at 3.6 seconds per day. So naturally I tried to measure it.
I synchronized the watch to internet "exact time" using the seconds hacking (wonderful) and then logged the time variance over three days, using the stopwatch to measure how many seconds it had gained. It seemed to be over 6 seconds per day. The METAS "golden ticket" is +5 seconds so I was a bit disappointed. I thought to myself that having spent the best part of seven thousand pounds it was typical that the watch that I bought was "out of whack", as they say.
I saw that in the USA, Omega offer a free "calibration" service so I emailed them to ask if this was available in the UK. The reply was that I should take it to an Omega Boutique (a.k.a "shop") and that they would examine and rectify any problem. I read more online and learned about the fact that you need to measure in different positions and store overnight in a particular way before getting a real "average" measurement.
So here we are now - before I bought the watch I was a normal person. Now I am panicking over a couple of seconds of my new watch and am googling and purchasing a timegrapher. To get some more accurate measurements and see if my 3861 is actually within METAS parameters.
I would be happy (after spending nearly £7000 for this watch) with say, +3.5 to 4 seconds - so let's see what happens. The time grapher arrives tomorrow. Watch this space (no pun intended).