Seiko Samurai PADI
The "Samurai" Prospex with the PADI colour story — angular case, ISO 6425 dive rating, the 4R36 caliber that finally gave Seiko divers hand-winding and hacking.
The Samurai's second life
The original "Samurai" reference (SBDA001) launched in 2004 with a titanium case and a 7S25 caliber. After a hiatus it returned in 2017 as the SRPB series — steel case, fresh dial designs, and the 4R36 caliber that fixed the 7S26's biggest complaint: now you can hand-wind and hack the seconds.
The PADI edition (in collaboration with the Professional Association of Diving Instructors) carries PADI's signature blue-and-red colour story on the bezel and dial — a nod to the GMT-Master "Pepsi" lineage but executed in matte tool-watch finishes.
Inside the Samurai PADI
The 4R36 is a 7S26 with the missing features: manual wind, hacking seconds, 24 jewels instead of 21, same 21,600 bph beat rate.
