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Remove the back of a Seiko


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At the very minimum you need a good case knife, e.g. "Japanese type". In stubborn cases a lever type special tool may become a saving. Then the problem could become closing it, for which a small press is used.
My advice, unless you are willing to spend money for proper tools, bring the watch to a shop. Otherwise more damage than the one it has already suffered will be made.

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4 minutes ago, philipk5 said:

Also have you got a new cell yet?

They are particularly pricey for the V157 / V158 (£50+)

Good point. As with any quartz watch there is no guarantee that just giving it power it will work. Perhaps one should attempt with a long exposure to strong light, or temporarily powering from a regular battery before spending for a new rechargable cell.

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