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Archer
··Omega Qualified WatchmakerThe ETA A08.L01 is a column wheel version of the ETA 7750. In addition to adding the column wheel, they rearranged the sub-dial layout by adding in some intermediate wheels to relocate the minute counter. Omega also uses this caliber, adding the co-axial escapement, for the Cal. 3330 watches.
As with all ETA 7750's, if you set the hands forward in time to the minute you want, there will be some lag in the start of the minute hand moving, due to the backlash in the gears of the setting mechanism. Moving the hands forward past the minute you want to set to, and backing up to the minute you want will take up the backlash.
As for how much is "acceptable" for the amount of backlash, 30 seconds is well beyond what I would expect to see on a 7750 based watch. I happen to have a 7750 here that's back for it's second service with me, and 5 years after the last service the backlash results in about 10 seconds before I see the minute hand move. I would say that is pretty typical, so if this really is 30 seconds, it's definitely out of the ordinary, at least in my experience (I service a lot of 7750 based watches, just for the record).
Note that the winding/setting parts in the Longines version, the Omega version, and the regular standard 7750 are all identical, so the fact that other things on this movement have been changed would not affect this at all.
The problem is easily solved by setting the time a certain way, and even if the backlash could be reduced, you will still have to do this. Is it worth sending it back to Longines? No idea if they will be able to do anything with it, but if I were servicing this and seeing that sort of backlash, I would be looking for an answer...
Hope this helps.
Cheers, Al
As with all ETA 7750's, if you set the hands forward in time to the minute you want, there will be some lag in the start of the minute hand moving, due to the backlash in the gears of the setting mechanism. Moving the hands forward past the minute you want to set to, and backing up to the minute you want will take up the backlash.
As for how much is "acceptable" for the amount of backlash, 30 seconds is well beyond what I would expect to see on a 7750 based watch. I happen to have a 7750 here that's back for it's second service with me, and 5 years after the last service the backlash results in about 10 seconds before I see the minute hand move. I would say that is pretty typical, so if this really is 30 seconds, it's definitely out of the ordinary, at least in my experience (I service a lot of 7750 based watches, just for the record).
Note that the winding/setting parts in the Longines version, the Omega version, and the regular standard 7750 are all identical, so the fact that other things on this movement have been changed would not affect this at all.
The problem is easily solved by setting the time a certain way, and even if the backlash could be reduced, you will still have to do this. Is it worth sending it back to Longines? No idea if they will be able to do anything with it, but if I were servicing this and seeing that sort of backlash, I would be looking for an answer...
Hope this helps.
Cheers, Al
