Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 26Jewels Automatic.

Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 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 : 5904838.
• Dial number : JAPAN 6206-8070T AD.
• Glass : Acrylic.
• Case size : About 36.51mm.
• Lug width : 19mm.
• Band : New Leather Strap of SEIKO original.

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 Sovereign Pioneer of 1965 Full-Day Business Elegance (1965): Manufactured in **1965**—a landmark year during Japan's post-war industrial expansion—the **Seiko Seikomatic Weekdater** reference **6206-8040** represented Suwa Seikosha's premier executive dress automatic. Designed to cater to modern business leaders during the Showa era, this reference perfected the ""Weekdater"" layout, setting the technical and visual blueprint for high-grade Japanese calendar wristwatches.

The Over-Engineered 26-Jewel Caliber 6206 Automatic Heart: Powering this historic timepiece is the celebrated **26-jewel Caliber 6206B**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Equipping an automatic watch in **1965** with a lavish **26-jewel specification** was a bold statement of micro-engineering luxury. Utilizing synthetic rubies to minimize gear-train friction, it features a quick-set date function, hand-winding capability, and Seiko's **Diashock** protection system.

Architectural ""8040"" Grammar of Design and Recessed Crown: The reference **6206-8040** is globally distinguished among vintage collectors for its adherence to Taro Tanaka's early **""Grammar of Design""** philosophy. Executed in solid stainless steel, the case features sharp, angular facets with mirror-polished Zaratsu planes. Engineered with a **flush, recessed crown at 4 o'clock**, the case maintains an uninterrupted, highly ergonomic silhouette that sits completely flush against the wrist.

Masterful ""Weekdater"" Dial Layout and Full-Day Window: The dial of the **6206-8040** is a masterclass in mid-century visual symmetry. It features a brilliant silver sunburst canvas decorated with **hand-applied, multifaceted hour indices** and sharp dauphine hands. The signature ""Weekdater"" layout showcases a framed date aperture at 3 o'clock paired with a prominent, **curved full-day window positioned above 6 o'clock**, proudly displayed in crisp typography.

The Sovereign Dolphin Case Back Medallion Heritage: The ultimate hallmark of this 1965 vintage treasure sits stamped on the case back: the iconic **Seiko Dolphin crest** (or deeply etched waterproof dolphin medallion). Certifying its factory-regulated water resistance and high-grade construction, the 6206-8040 Seikomatic Weekdater remains an indispensable, highly collectible cornerstone reference representing the golden age of Japanese automatic horology.

For more information, please look at the pictures.

Notes

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