File Fossil_Watch_Instructions_EN_US.pdf is a compendium of instructions for a large number of Fossil movements, and it is unclear which movement the model CH-2331 watch uses. However, movement OS10 (page 15) appears to be the only one that matches the dial layout, button layout and also has a date window. The watch has a quartz analog mechanism and uses one SR927W 1.55-volt silver oxide button cell. Silver oxide cells have low current output, but very long shelf life, so if the stem is pulled out completely when the watch isn't being worn, the battery may last many years.
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