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| The Casio F-B100W-1BJF (pictured) comes with a negative display instead of the positive display on the other two in the lineup. |
Japanese watch retailers have begun posting restock dates for Casio's wildly popular F-B100W, but eager buyers may need to exercise patience — the earliest useful window appears to be later than the stock itself actually arrives.
Great G-Shock World reported on Sunday (August 23) that multiple Japanese shops are now listing early September for the next delivery. The enthusiast blog does caution, however, that those units are largely spoken for. Stores have accumulated significant back-orders since launch, and estimates suggest unreserved stock is unlikely to surface before late September.
A Perfect Storm of Demand and Timing
The F-B100W's journey to market has been anything but smooth. Preorders opened on August 1 and cleared within days, while the watch officially went on sale on August 7 — just days before Obon, Japan's mid-August holiday period. Casio's own operations paused for the break precisely when demand needed servicing most, and distribution stalled alongside. A small quantity did reappear on Casio's official online store once the holiday ended, according to the blog, but is no longer listed.
For the latest updates and retailer information, check the ongoing coverage at G-Shock Japan Blog.
Why the F-B100W Is Generating So Much Buzz
The Japanese enthusiast blog describes the F-B100W as the most in-demand Casio watch currently on sale in Japan — even above the iconic G-Shock range. It's worth noting, however, that this is the blog's assessment rather than official sales figures. Casio typically does not publish unit numbers, making it difficult to quantify the scale of demand.
The source also mentions an inversion worth noting: ahead of major Japanese holidays, Casio has sometimes pushed inventory into the market rather than holding it. Usually, this makes back-ordered references briefly easier to buy. That didn't happen here — and the shortage continues.
What Makes the F-B100W Special?
The F-B100W takes the classic F-91W case — one of Casio's most beloved designs — and supercharges it with modern connectivity. Bluetooth and a motion sensor feed a monthly life log in Casio's Watches app, tracking step and calorie totals against user-set goals. It's a nostalgic design with smartwatch functionality, striking a chord with both vintage collectors and fitness-conscious buyers.
Launched in Japan at ¥8,800, the watch reached the UK at £55 on August 17, where the black reference has since sold out.
Where to Buy
If you're looking to add the F-91W to your collection while waiting for the F-B100W, check availability on Amazon.
Stay tuned for further updates as the situation develops. With restock dates now emerging, we'll continue tracking availability across Japanese and international retailers.
