Hi,
Need some help here before I tear down this watch. I am fixing a friends Seiko 7548-700F Qtz (1981 Model) and, after putting in a new battery, it stops after running exactly 5 minutes. If I advance the minute hand a bit, it starts running again. When it stops, the second hand seems to stutter in place. Any thoughts or experience here? Is this a bad gear or dirt? I do intend on disassembling an hand cleaning all the parts.