SOURCE: My casio Sport spw-1000-2ver has OPEN marked on
It sounds like the battery is dead, or low. Take it in to a watch repair shop and get it replaced, and if that doesn't work, they can probably give you an estimate on repair.
Good luck, and hope this helps. If you just want to try to replace the battery first, the Walmart jewelry sections can do that cheaply (for the nominal cost of the battery).
Good luck, and hope this helps.
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