How to change 3191 back to 12 hour time? (details in comments) : r/casio
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User manual Casio 3191 (English - 1 pages)
Module 3191 24h mode for time ? | WatchUSeek Watch Forums
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User manual Casio 3191 (English - 1 pages)
How to adjust a Casio women's watch to a 12-hour system instead of a 24-hour clock LA670W 3191 - YouTube