The Casio F-91W has been in continuous production since 1989, but vintage original Japan-made variants (pre-1996) trade at a premium over current Thailand-made units. Same module 593 movement, same EUR 15 retail price at launch, but the build quality and case sharpness of the original Japanese production is noticeably better.
Used pricing in 2026: EUR 30-90 for confirmed Japanese-production examples (caseback marked "Japan").
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Confirm "Japan" on the caseback - "Thailand" markings indicate current production, available new for EUR 15 anywhere. The original Japanese resin is slightly more amber-toned and the case ridges are crisper.
Battery life is 7 years; replacement is a 5-minute job at any watch shop.