Vintage 1965 JAPAN SEIKO SEA HORSE 6601-8000 17Jewels Automatic.

Vintage 1965 JAPAN SEIKO SEA HORSE 6601-8000 17Jewels Automatic.

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

Item description

Movement :

• Pet name : SEA HORSE.
• Caliber number : 2451.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1961's.
• Factory : Suwa.

Externals :

• Serial number : 5D00830.
• Dial number : JAPAN 6601-8000R AD.
• Glass : Acrylic.
• Case size : About 35.4mm.
• Lug width : 19mm.
• Band : New Leather Strap.

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.
• The movement may have been replaced.

Key Features

The Sovereign Peak of 1965 Sea Horse Aquatic Heritage (1965): Manufactured in **1965**—a historic year during Japan's mid-century expansion—the **Seiko Sea Horse** reference **6601-8000** stands as one of Suwa Seikosha's quintessential early light-aquatic dress automatics. Positioned within Seiko's legendary ""Sea Horse"" line, this model offered post-war professionals enhanced water-resistant construction paired with timeless mid-60s dress aesthetics.

The Over-Engineered 17-Jewel Caliber 6601 Automatic Engine: Powering this historic timepiece is the dependable **17-jewel Caliber 6601**, an in-house automatic engine operating at a classic frequency of **18,000 vibrations per hour (vph)**. Developed as the automatic counterpart to the famous manual-wind Caliber 66 series, this engine incorporates Seiko's proprietary **Diashock** anti-shock architecture and the high-efficiency Magic Lever self-winding system for robust daily performance.

Architectural ""8000"" Water-Resistant Case and Recessed Crown: Sourced in a solid stainless steel case, the reference **6601-8000** features bold, sweeping lugs with sharp Zaratsu-polished chamfers and a clean bezel profile. Designed with Suwa's signature **recessed crown hidden flush at 4 o'clock**, the case maintains a completely seamless, crownless silhouette that sits flat against the wrist while providing daily aquatic protection.

Immaculate Time-Only Dial Harmony and Script Typography: The dial of the **6601-8000** is an exercise in mid-century visual purity, displaying a radiant silver sunburst canvas set with **hand-applied, multifaceted rectangular hour indices** and sharp dauphine hands. Completely free from calendar aperture clutter, it proudly features the classic flowing script **""Seikomatic""** or **""Seiko""** logo paired with the sought-after **""Sea Horse""** text and Suwa factory insignia above 6 o'clock.

The Sovereign Deeply Etched Sea Horse Case Back Medallion: The ultimate seal of aquatic provenance rests on the case back: the iconic **deeply etched Seiko Sea Horse motif** set into the center. Certifying its factory-regulated precision and reinforced water-resistant case construction, the 1965 6601-8000 17-jewel Sea Horse stands as a highly collectible, investment-grade cornerstone reference for vintage Seiko purists worldwide.

For more information, please look at the pictures.

Notes

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