Vintage 1965 JAPAN SEIKO SEA HORSE 66-7000 17Jewels Hand-winding.

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

Item description

It's a SEIKO Hand-winding Watch, SEA HORSE 66-7000 17Jewels .
It's in good used condition.
It's difficult to find this valuable watch in such a good condition. Highly recommended for SEIKO collectors!
Movement :
  • Pet name : SEA HORSE.
  • Caliber number : 66A,B.
  • Movement : Hand-winding.
  • Beat rate : 18000bph.
  • Year of manufacture start : 1960's.
  • Factory : Kameido.
Externals :
  • Serial number : 5200417.
  • Dial number : JAPAN 66-7000T.
  • Glass : Acrylic.
  • Case size : About 32.38mm.
  • Lug width : 17mm.
  • Band : Wrist size that can be worn is Up to about 182mm.
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 Sport-Dresser Design (1965): In **1965**, the **Seiko Sea Horse** occupied a unique position as a ""Water Proof"" dress watch. While not a professional diver, the reference **66-7000** was designed for the active lifestyle of the mid-60s, offering enhanced durability against the elements. It bridged the gap between formal attire and weekend adventure, making it one of the most versatile and beloved models from the **Daini Seikosha (Kameido)** factory.
  • The Reliable Caliber 66A: This watch is powered by the **17-jewel Caliber 66**, a manual-wind workhorse operating at **18,000 vibrations per hour (vph)**. Known for its simple, robust architecture, the Caliber 66 was a ""no-nonsense"" movement that prioritized long-term reliability and ease of service. In **1965**, this movement was the heart of Seiko’s mid-range manual lineup, favored for its steady performance and tactile winding feel.
  • Iconic ""Sea Horse"" Heritage: The defining characteristic of the reference **66-7000** is the **etched Sea Horse logo** on the case back. This emblem was Seiko's hallmark for its water-resistant models of the era. To ensure this protection, the case featured a beefier construction and a screw-down case back, which was a significant technical upgrade for a daily-use watch in **1965**.
  • Mid-Century Minimalist Dial: The dial of the **66-7000** is a masterclass in 1960s functionalism. It typically features a clean, silver sunburst finish with **bold, applied baton indices** and sharp ""Dauphine"" hands. The omission of a date window on this specific reference enhances the perfect symmetry and timeless aesthetic, reflecting the ""Zen"" simplicity that Japanese design is internationally praised for.
  • A Durable Mechanical Classic: Produced in **1965**, the Sea Horse 66-7000 remains a staple for vintage collectors due to its rugged charm and historical significance. It represents the early days of Seiko’s obsession with ""Water Proof"" technology—a path that eventually led to their world-class professional divers. Its classic proportions and mechanical honesty make it a quintessential example of **mid-century Japanese tool-watch elegance**.
    • For more information, please look at the pictures.
    Notes
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