Powered by a Legendary Workhorse

Owning this Seiko SRPD79 is owning a small but genuine piece of manufacture horology: a robust, in-house automatic engine that powers a purpose-built sports watch at a price that invites exploration. The SRPD79 pairs that dependable movement with a 42.5 mm stainless-steel case, unidirectional bezel and Hardlex crystal—an honest tool with a mechanical soul.

Specifications of the Legendary 7S26 / 4R36 Calibre

Reference Number: SRPD79
In-House Automatic Calibre: 4R36 (Seiko-made automatic movement with manual winding capacity)
Diashock Protection System: Yes — built for daily knocks and long-term reliability
Day‑Date Complication: Day and date display for practical, everyday use
Bi-directional Winding Rotor: Yes — efficient winding from normal wrist motion, plus manual wind capability
Number of Jewels: 24 jewels
Case & Crystal: Stainless-steel case with hard coating; Hardlex crystal
Bezel & Size: Unidirectional rotating bezel; 42.5 mm diameter

The Curator’s Insight:
The 4R36 (and its celebrated 7S26 predecessor) is one of the most produced and trusted automatic engines in modern watchmaking — a workhorse that delivers decades of service with modest care, and the true reason the Seiko 5 has earned such enduring affection.

The Most Accessible Piece of In-House Horology

This SRPD79 is proof that genuine manufacture engineering need not be reserved for the few: it places a durable, serviceable Seiko automatic movement on the wrist with a sports-ready specification and a clear, honest purpose. For anyone who values mechanical integrity and wants an authentic automatic experience without compromise, the Seiko 5 remains the smartest first step.