Vintage Seiko Seahorse Diashock 17 Jewels (Ref. 66-8980) – December 1964

An Elegant Mid-Century Icon of Japanese Horology
Up for sale is a beautiful, classic example of vintage craftsmanship: a Seiko Seahorse Diashock from late 1964. Striking the perfect balance between a robust everyday tool watch and a refined dress piece, the Seahorse line remains highly coveted by collectors for its understated aesthetics, historical significance, and rock-solid reliability.

Specifications
Brand & Model: Seiko Seahorse Diashock

Reference Number: 66-8980

Serial Number: 4D00856 (Dating the watch
precisely to December 1964)

Movement: Manual-winding Caliber 66A (17 Jewels)

Dial: Original White/Silver Sunburst with Applied Indices

Hands: Polished Dauphine Hands

Shock Protection: Seiko Diashock System

Detailed Breakdown
The Dial & Hands: The star of the show is the captivating white/silver sunburst dial, which radiates from the center and catches the light beautifully at every angle. It is perfectly complemented by razor-sharp, polished dauphine hands and applied faceted indices, giving the watch incredible depth and a timeless, mid-century architectural feel.

The Case & Caseback: Featuring a crisp and classic stainless steel case profile, this watch sits remarkably flat and elegant on the wrist. The screw-down caseback proudly features the iconic, stamped Seiko Seahorse logo alongside the crisp reference and serial numbers—a hallmark of Seiko's early water-resistant heritage.

The Movement: Powering the watch is the Seiko Caliber 66A, a pure hand-wound workhorse revered by collectors and watchmakers alike for its simple, robust architecture and legendary durability.
Equipped with 17 jewels and Seiko’s proprietary Diashock system, it is a movement built to last generations. Freshly serviced running at a rate of +2s/Day, 230°AMP and 0.0ms BE.