My Valjoux 7750 movement 18ct Tissot Time Lord regularily keeps pase with my Breitling Quartz.
after 7-8 days there can be just a second or so difference I dont wear the watch very much but it is the only watch I use
If my Breitling 1997 Pluto was running wrong then surely they would not match, the chances of both watches have the same loss would be too high.
This watch has a heavy gold case 2 troy ounces gold, could this be absorbing magnetic interference?
The Watch has a see through back its not Quartz.