This serviced 1964 Seiko Sportsmatic Calendar 820 represents a foundational moment in Seiko's mid-century design, bringing dependable automatic performance and modern date functionality to the forefront. Driven by the reliable 17-jewel Caliber 820 (later designated Cal. 7625) automatic movement, it delivers smooth mechanical winding and robust timekeeping. Following a full service, it runs accurately and reliably for daily wear.
The hallmark of this timepiece is its 100% factory-original silver sunburst dial, featuring sharp applied indices and a framed date window at 3 o'clock. The clean, balanced layout captures light beautifully, preserving the authentic 1960s dress-watch charm.
The 37mm EGP (Elegant Gold Plated) case remains in very good condition, retaining its factory geometry, warm golden presence, and signature recessed crown positioned discreetly at 4 o'clock. Every core component of the watch head, including the original dial, crystal, crown, and case, remains entirely original and factory-correct. It comes paired with a high-quality replacement leather strap.
A key historical predecessor to the iconic Seiko 5 series, this 1964 Sportsmatic Calendar 820 offers an exquisite blend of 1960s Japanese horological heritage and timeless elegance.
