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Casio F-30 Early 90's simple vintage. Just spent 20 minutes working out how to change the battery. See picture 2 to see why! : r/casio
![Casio's WSD-F30 is a longer-lasting and (slightly) slimmer rugged smartwatch - NotebookCheck.net News Casio's WSD-F30 is a longer-lasting and (slightly) slimmer rugged smartwatch - NotebookCheck.net News](https://www.notebookcheck.net/fileadmin/Notebooks/News/_nc3/2018_08_29_14_59_03_Lineup___WSD_F30___Products___Smart_Outdoor_Watch___PRO_TREK_Smart___CASIO.png)
Casio's WSD-F30 is a longer-lasting and (slightly) slimmer rugged smartwatch - NotebookCheck.net News
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Casio Pro Trek Smart WSD-F30 smartwatch has a smaller case, better power management, and improved dual-layer display
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