Serviced Vintage 1966 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 : 6003596.
• Dial number : JAPAN 6206-8040R AD.
• Glass : Acrylic.
• Case size : About 36.1mm.
• 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.
• Overhaul service in March 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

The Quintessential Business Automatic (1966): By **1966**, the **Seikomatic Weekdater** had established itself as the indispensable tool for Japan's rapidly growing professional class. The reference **6206-8040** was produced by the **Suwa Seikosha** factory during a period of peak mechanical refinement. It offered a sophisticated blend of high-end features and robust reliability, making it the ""Gold Standard"" for automatic watches in the mid-60s business world.

The High-Performance 26-Jewel Caliber 6206: This watch is powered by the **26-jewel Caliber 6206B**, an automatic movement operating at **18,000 vibrations per hour (vph)**. In **1966**, a 26-jewel count was a premium specification, ensuring that the critical points of the automatic winding train and the dual-calendar mechanism were protected by synthetic rubies. This movement is famous for its **Magic Lever** winding system, which provided incredible efficiency for the active wearer.

Iconic ""8040"" Grammar of Design Case: The reference **6206-8040** features a classic, round stainless steel case with sharp, mirror-polished lugs that reflect the early principles of the **Grammar of Design**. The **crown is hidden at the 4 o'clock position**, maintaining a sleek and uninterrupted profile. This was a deliberate design choice in **1966** to visually signal that the watch was a ""pure automatic"" that did not require manual winding to keep perfect time.

Architectural ""Weekdater"" Dial Layout: The dial of the **6206-8040** is a masterclass in mid-century symmetry, featuring the date at 3 o'clock and the iconic **arched day-of-the-week window at 6 o'clock**. With its crisp sunburst silver finish and **hand-applied, multi-faceted indices**, the dial was engineered for maximum legibility under the fluorescent lights of modern offices, a hallmark of Seiko's functional Japanese aesthetic.

A Landmark of Suwa Seikosha Engineering: Produced in **1966**, the reference 6206-8040 remains one of the most beloved entries in the Seikomatic lineage. It represents the ""mature"" phase of the 62-series, combining a **rugged, high-jewel movement** with a timeless, formal elegance. Today, it is prized by collectors as a quintessential example of the mechanical excellence that paved the way for the Grand Seiko and King Seiko dynasties.

For more information, please look at the pictures.

Notes

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  The vintage watches we sell are inspected and adjusted so they work fine. However, since it is an vintage watch, Please purchase on the assumption that it will be repaired.
  
  
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