Casio F91W-1 Black Digital Watch

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The black resin F91W-1 adds a different routine: a conventional replaceable battery rather than charging or winding. Casio specifies a 38.2 × 35.2 × 8.5 mm case, 21 g weight and approximately seven years on a CR2016 battery. That is a manufacturer estimate, not a guarantee for every owner's usage. Its resin band has a published 145–200 mm fit range; a rectangular case's width is not directly equivalent to a round watch's diameter. The digital display includes a daily alarm, stopwatch and LED light. Treat its plain Water Resistant marking as protection for everyday splashes and rain, not swimming. Casio also says not to press buttons while wet and to avoid soap or detergent exposure. The verified black Amazon listing identifies manufacturer part F91W-1, with F-91W-1X in its model field. These are researched manufacturer specifications checked October 27, 2026. FindVault has not worn or hands-on tested this watch.