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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?
 

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Have you tried it out of the case?
I've had some success previously swiftly advancing the seconds hand with a tooth pic- can dislodge small particles of 'dirt'
 
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