Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8990 26Jewels Automatic.

Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8990 26Jewels Automatic.

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

Item description

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 : 5702553.
• Dial number : JAPAN 6206-8990R.
• Glass : Acrylic.
• Case size : About 37.1mm.
• Lug width : 19mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week : Kanji 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 10:00 and 1:00
• 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 Sovereign Peak of Mid-60s Full-Calendar Executive Luxury (1965): Manufactured in **1965**—a pivotal historical year during Japan's post-war economic modernization—the **Seiko Seikomatic Weekdater** represented Suwa Seikosha's benchmark executive line. Sourced under reference **6206-8990**, this mid-1960s flagship was engineered to deliver top-tier automatic reliability paired with high-grade internal mechanical finishing and distinct full-calendar legibility.

The Over-Engineered 26-Jewel Caliber 6206 Automatic Heart: Powering this historic timepiece is the revered **26-jewel Caliber 6206B**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Equipping an executive dress watch in **1965** with a lavish **26-jewel specification** minimized gear-train pivot wear, delivering exceptional long-term accuracy and incorporating Seiko's proven **Diashock** anti-shock architecture.

Architectural ""8990"" Case Geometry and Recessed Crown Integration: The reference **6206-8990** is globally distinguished among vintage Seiko collectors for its broad, sharp-faceted stainless steel case architecture. Designed with an ultra-thin bezel profile and the iconic **recessed crown at 4 o'clock**, the case achieves a seamless, crownless silhouette that sits remarkably flat and flush against the wrist.

Iconic Separate ""Weekdater"" Layout and Dial Harmony: The dial of the **6206-8990** is a masterclass in mid-century visual balance, featuring a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular block indices**. It showcases the celebrated **arched day window above 6 o'clock** displaying the full day of the week, perfectly balanced by the independent date calendar window framed at 3 o'clock.

The Sovereign Gold Dolphin or Engraved Case Back Heritage: The ultimate hallmark of this 1965 treasure sits proudly on the case back: the iconic **embossed gold or deeply engraved Seiko Dolphin crest**. This emblem historically certified its factory-regulated precision standard and water-resistant case construction, securing the 6206-8990 as an eternal, investment-grade cornerstone reference for collectors worldwide.

For more information, please look at the pictures.

Notes

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