Vintage 1966 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 26Jewels Automatic.

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

Item description

It's a SEIKO Automatic Watch, SEIKOMATIC WEEKDATER 6206-8040 26Jewels .
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 : SEIKOMATIC WEEKDATER .
  • Caliber number : 6206A,B.
  • Movement : Automatic.
  • Beat rate : 18000bph.
  • Year of manufacture start : 1963's.
  • Factory : Suwa.
Externals :
  • Serial number : 6306396.
  • Dial number : JAPAN 6206-8070R AD.
  • Glass : Acrylic.
  • Case size : About 36.13mm.
  • Lug width : 19mm.
  • Band : New Leather Strap.
Condition :
  • Used, it runs well.
  • Quick set(Day/Date) : Okay.
    Set the day of the week : English only.
    Set of the date : The set at one stage pulling the crown.
    Set of the days of the week : Iteration the hour hand at 9:00 and 12:00
  • 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 Seikomatic Line: The **Seikomatic** line was a high-grade series of automatic watches produced in the 1960s by the Suwa Seikosha factory. It bridged the gap between the mass-market *Sportsmatic* and the top-tier *Grand Seiko*, offering superior finishing and reliability.
  • The 6206 Caliber: The watch is powered by the **Caliber 6206**, a 26-jewel automatic movement operating at **18,000 vibrations per hour (vph)**. This caliber is historically significant as it is the direct ancestor of the movement used in the first automatic Grand Seiko, the **62GS** (Caliber 6245/6246).
  • The Weekdater Complication: The ""Weekdater"" models featured a full **day and date display**, signifying a commitment to practical daily wear. The 6206 movement includes a **quickset date** mechanism (pulling the crown out one click).
  • Design and Crown: The reference **6206-8040** typically features a clean, elegant case design, adhering to the early principles of the **Grammar of Design**. A notable characteristic of the 62-series is the **recessed crown at the 4 o'clock position**, which signaled its automatic nature (no daily hand-winding required) and enhanced comfort.
  • Historical Context (1966): The year **1966** represents the peak of Seiko's development phase for the 62-series. This platform established a standard for Japanese automatic watches in the mid-1960s, known for its robustness, smooth winding, and aesthetic excellence.
    • For more information, please look at the pictures.
    Notes
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