Casio F-91W

The Casio F-91W is quite possibly the most iconic digital watch ever made. In production since 1989 and still sold today, this ultra-affordable timepiece has graced the wrists of everyone from schoolkids to world leaders. Its minimalist design, legendary battery life (rated at seven years), and near-indestructible resin case make it the ultimate everyday watch — and a stealth style icon.

The F-91W is collectible in a different way than most items on this site. New units are still cheap, so the collector interest centers on vintage examples: early production runs from the late 80s and early 90s with specific module numbers, original packaging, and aged patina. The watch has also become a fashion statement in its own right, embraced by streetwear culture and the minimalist design community. Special colorways and regional variants add variety for completionists.

When buying vintage F-91Ws, check the module number on the caseback — earlier modules indicate older production. The LCD should display all segments clearly with no bleed or missing pixels. Test the backlight (the original green-tinted EL light is part of the charm), the alarm, and the stopwatch function. The resin strap on older units may be brittle or cracked — replacements are readily available and cheap. For collectors, the original blister pack or cardboard box with matching serial numbers adds the most value.