In the quiet calculus of consumer desire, Casio's modest step-tracking watch — a £55 descendant of the iconic F-91W — sold out across Japan and the UK within days of its debut, leaving only a teal variant behind. The F-B100W-1A offers Bluetooth connectivity and a motion sensor in a familiar shell, yet its disappearance from shelves raises the older question of whether scarcity reflects genuine demand or simply the arithmetic of cautious production. Casio has said nothing about restocking, and the American market has yet to receive so much as a price.