I just had my Fireman synch and date adjusted on the 2nd after a month. I am happy to note that the ETA2824 has settled to a +6s/day reading now after several months. :biggrin:
Ball watches in generally seems to be pretty accurate right out of the box, even the non-COSC models. Many of them are performing within COSC specs. :thumbup: My EMII Classic is doing +5 secs/day (worse case on winder) and when worn for 9 hrs/day, its doing +2 secs/day on average.
The most accurate Ball I have is an Engineer Master II Chrono, serial 864/999. It's less than 1 sec per day (fast). My Mad Cow and Engineer Master II GMT II both are 3 to 4 secs/day fast. I am impressed. I wear the cow everyday at all times, even in the sauna....it's great for showing how many minutes I stay in the heat AND I need not worry about the extreme temperatures - its accuracy remains at 3-4 secs/day.