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The battery is most likely to be dead, from what you have mentioned so far.
The likelihood of that guess would be based mainly on how old the watch (and its battery) is.
How old is the watch?
Would you be interested in having it service-repaired and/or having the battery replaced?
- if so, let me know your approximate locale, either by post code, or by town/city and region, please. Use the Reply To Expert function to let me know. Thanks.