Harold's Gear Kamen Rider Build Sento Model Watch
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The Harold's Gear Kamen Rider Build Sento Model Watch is the equation-dial cuff watch Bandai sells as the one Sento Kiryu wears in episode 1 of Kamen Rider Build, a claim quoted here, not frame-checked: every hour is a formula only the physicist can read, on a brass head in a wide leather cuff. The 2017 Sento Model, handmade in Japan by a Harold's Gear Designers Guild craftsman, took orders from September 4, 2017 at ¥86,400; the 2021 Reboot Edition, announced August 3, 2021 at ¥52,800, plated the brass and added 3 bar and a Build-engraved back, made in China. Licensed merchandise, not a watch shown on screen. (GAME Watch (Impress); Bancole (2017 Sento Model), via the Wayback Machine; Kamen Rider Web (Toei); Bancole (2021 Reboot Edition), via the Wayback Machine)
Premium Bandai listings
Bandai has kept the Reboot Edition on sale through repeated Premium Bandai listings, each under a new item number: 1000198639 (August 2023); 1000200252 (October 2023); 1000204909 (December 2023); 1000211512 (May 2024); 1000214030 (June 2024); 1000218387 (October 2024); 1000222121 (December 2024); 1000223882 (January 2025); LadyEve reported a further re-run in July 2025 as 1000233065, and 1000249674 appears as a 2026 listing in Premium Bandai's related-products panels. Each listing's product photograph shows the Reboot Edition. (LadyEve; LadyEve (listing mirror); Premium Bandai (item 1000214030), via the Wayback Machine)
Premium Bandai's archived Kamen Rider series listing also carries item 1000136211 (archived January 2026), numbered among the 2019 listings, whose photograph shows the original Sento Model, and a further Reboot Edition lot, 1000242654 (archived December 2025). (Premium Bandai Kamen Rider series listing (archived January 23, 2026), via the Wayback Machine; Premium Bandai Kamen Rider series listing (archived December 26, 2025), via the Wayback Machine)
Premium Bandai's archive shows the watch under further item numbers: 1000170316 (on the Kamen Rider series listing archived March 8, 2022); 1000189637 (on the Kamen Rider series listing archived February 28, 2023). Each lot's product photograph shows this watch. (Premium Bandai Kamen Rider series listing (archived March 8, 2022), via the Wayback Machine; Premium Bandai Kamen Rider series listing (archived February 28, 2023), via the Wayback Machine)
Media relationships
Official partnerships
| Title | Year | Type |
|---|---|---|
| Kamen Rider Build (2017) | 2017 | TV Series |