Vintage 1965 JAPAN SEIKO SEA HORSE 66-8980 17Jewels Hand-winding.

Vintage 1965 JAPAN SEIKO SEA HORSE 66-8980 17Jewels Hand-winding.

Welcome to my auction!
I am Japanese who live in Tokyo.

Item description

Movement :

• Pet name : SEA HORSE .
• Caliber number : 66A.
• Movement : Hand-winding.
• Beat rate : 18000bph.
• Year of manufacture start : 1960's.
• Factory : Suwa.

Externals :

• Serial number : 5801105.
• Dial number : JAPAN 66-8930T.
• Glass : Acrylic.
• Case size : About 35mm.
• Lug width : 18mm.
• Band : Wrist size that can be worn is Up to about 190mm.

Condition :

• Used, it runs well.
• The day difference time of an used watch is about +-1 minute / day.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

The Pioneer of 1965 Water-Resistant Sports-Dress Design (1965): Manufactured in **1965**—a milestone era in Japanese watchmaking immediately following the 1964 Tokyo Olympics—the **Seiko Sea Horse** reference **66-8980** represents one of Suwa Seikosha's earliest dedicated water-resistant tool-dress lines. Positioned as a rugged yet refined daily instrument for active professionals, the ""Sea Horse"" series laid the structural foundation for Seiko's iconic lineage of water-ready sports watches throughout the 1960s.

The Ultra-Reliable 17-Jewel Caliber 66 Hand-Winding Workhorse: Powering this historic watch is the celebrated **17-jewel Caliber 66B (or 66A)** hand-wound movement, operating at a classic frequency of **18,000 vibrations per hour (vph)**. Renowned among vintage purists for its robust simplicity and ease of servicing, this 17-jewel engine incorporates Seiko's proprietary **Diashock** shock-absorption system, delivering exceptional daily durability, smooth tactile manual-winding, and steady timekeeping performance.

Architectural ""8980"" Stainless Steel Case & Screw-Down Back: Sourced in a solid stainless steel case, the reference **66-8980** features sharp, sweeping dress lugs with polished chamfers and strong mid-century proportions. Unlike standard dress watches of the mid-1960s that utilized snap-on backs, the Sea Horse was built with a heavy-duty **screw-down case back** and gasket-sealed crown, engineered specifically to guard against moisture and dust ingress.

Immaculate Non-Date Dial Balance and Cursive Typography: The dial of the **66-8980** is a masterclass in classic mid-century visual purity, set against a radiant silver sunburst canvas free from calendar interruptions. It features **hand-applied, multifaceted rectangular hour indices** paired with sharp dauphine hands. The lower dial is proudly signed with the iconic flowing **""Sea Horse"" cursive script**, along with **""WATERPROOF""** and **""DIASHOCK 17 JEWELS""** text above 6 o'clock.

The Sovereign Sea Horse Case Back Medallion / Etching: The ultimate hallmark of authenticity sits on the case back: the iconic **engraved Sea Horse motif** (or seahorse insignia alongside the waterproof text). Certifying its specialized factory status within Suwa Seikosha's early water-resistant lineup, the 1965 Seiko Sea Horse 66-8980 remains a highly coveted, investment-grade cornerstone reference for collectors of mid-60s Japanese horological heritage.

For more information, please look at the pictures.

Notes

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