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 : 5604844.
• Dial number : JAPAN 6206-8990T AD.
• Glass : Acrylic.
• Case size : About 37mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 200mm.

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 Peak of 1965 Executive Weekdater Heritage (1965): Manufactured in **1965**—a historic year during Japan's mid-century economic boom and horological golden era—the **Seiko Seikomatic Weekdater** reference **6206-8990** stands as a classic executive dress automatic from Suwa Seikosha. Evolving directly from the early J13080 platform, this reference solidified Seiko's signature full-day arched calendar layout for high-ranking corporate professionals.

The High-Grade 26-Jewel Caliber 6206 Automatic Engine: Powering this historic timepiece is the robust **26-jewel Caliber 6206B**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Equipping a mid-1960s dress watch with an elevated **26-jewel count** provided exceptional gear-train pivot protection, featuring a quick-set date mechanism and Seiko's highly efficient Magic Lever self-winding architecture.

Architectural ""8990"" Broad-Lugging Case and Recessed Crown: Sourced in a heavy-gauge stainless steel case, the reference **6206-8990** features bold, sweeping lugs with thick Zaratsu-polished chamfers and clean geometric lines. Designed with a slim bezel profile and the signature **recessed crown hidden at 4 o'clock**, the case maintains a completely seamless, crownless silhouette that sits flush and commanding on the wrist.

Historic Arched ""Weekdater"" Dial Layout and Mid-Century Elegance: The dial of the **6206-8990** displays a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular block indices** and razor-edged dauphine hands. It proudly showcases the iconic **curved full-day aperture positioned above 6 o'clock**—spelling out days like ""MONDAY"" in bold typography—perfectly balanced by the framed date window at 3 o'clock and the script **""Seikomatic""** text.

The Sovereign Solid Gold Dolphin Case Back Medallion: The ultimate hallmark of prestige rests on the case back: the iconic **solid gold-embossed Seiko Dolphin medallion** set into the center. Certifying its elite factory-regulated chronometric precision and water-resistant construction, the 1965 6206-8990 26-jewel Seikomatic Weekdater stands as an indispensable, investment-grade cornerstone reference for collectors worldwide.

For more information, please look at the pictures.

Notes

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