Vintage 1964 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8990 26Jewels Automatic.

Vintage 1964 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8990 26Jewels Automatic.

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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 No. : 4801696.
• Dial No. : MADE IN JAPAN 6206-8990R.
• Glass : Acrylic.
• Case size : About 37.11mm.
• 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 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 Dawn of Executive Weekdater Design (1964): Manufactured in 1964—a monumental historical year marked by the Tokyo Olympic Games and Seiko's global horological emergence—the Seiko Seikomatic Weekdater reference 6206-8990 stands as a foundational executive automatic timepiece from Suwa Seikosha. Positioned at the core of Seiko's high-grade business watch lineup, this mid-1960s cornerstone established the classic dual-calendar layout that defined Showa-era corporate elegance.
• The High-Grade 26-Jewel Caliber 6206 Automatic Heart: Powering this historic watch is the respected 26-jewel Caliber 6206A, an in-house automatic movement operating at 18,000 vibrations per hour (vph). Utilizing a lavish 26-jewel specification to reduce gear-train friction across critical wheel pivots, it features Seiko's Diashock anti-shock protection, efficient magic-lever automatic winding, and a dedicated quick-set date calendar mechanism.
• Architectural ""8990"" Classic Case and Recessed Crown Profile: Executed in a solid stainless steel case, the reference 6206-8990 features long, sweeping lugs with crisp polished facets and substantial wrist presence. Incorporating Suwa's signature recessed crown at 4 o'clock, the case maintains a smooth, completely symmetrical silhouette that sits flush against the wrist and glides seamlessly beneath a formal suit cuff.
• Iconic Arch Day Window and Sunburst Dial Layout: The dial of the 6206-8990 is a masterclass in mid-century layout visual balance, featuring a radiant silver sunburst backdrop set with hand-applied, multifaceted rectangular block indices. It is famously recognized by its distinct arched full day-of-the-week window positioned at 6 o'clock (or 12 o'clock depending on dial variation), complemented by a framed date aperture at 3 o'clock and bold ""SEIKOMATIC"" typography.
• The Sovereign Dolphin Case Back Medallion Heritage: Embellishing the backplate of this 1964 treasure is the iconic embossed Seiko Dolphin crest (or silver waterproof medallion). Certifying its factory-tested water resistance and high-grade automatic construction, the 6206-8990 26-jewel Seikomatic Weekdater remains an indispensable, highly collectible cornerstone reference for vintage Seiko purists worldwide.

For more information, please look at the pictures.

Notes

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