I have an omega seamaster bought 1998 rarely i used it i took it now for use and it runned fast like 15 minutes evety three hours the omega service in chile wanted to charge close to us 300 for diagnostic for mi it was like magic i put the watch on demagnetizer a few seconds and the watch was running like newto diagnostic if your watch is magnetized place it close ot a magnetic compass if the dial moes you have this problen and you need to demagnetizer it