Serviced 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 : 5806625.
• Dial number : JAPAN 6206-8990R.
• Glass : Acrylic.
• Case size : About 37.1mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 193mm.

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.
• Overhaul service in June 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

The Standard of Mid-60s Business Authority (1965): In **1965**, following the global success of the 1964 Tokyo Olympics, the **Seiko Seikomatic Weekdater** stood as the definitive timekeeping standard for Japan's booming white-collar management class. The reference **6206-8990** was engineered by the **Suwa Seikosha** factory during a landmark era of intense industrial pride. Explicitly designed to offer rising corporate executives a level of structural prestige and daily functionality, it became an iconic status symbol that perfectly mirrored the confidence of Japan’s high-growth economic miracle.

The Grand-Tier 26-Jewel Caliber 6206 Heart: This watch is powered by the magnificent **26-jewel Caliber 6206**, a high-grade automatic movement operating at a classic frequency of **18,000 vibrations per hour (vph)**. The 62-series architecture is highly revered among horological purists as the exact engineering foundation that later spawned the first-ever Automatic Grand Seiko (62GS). Deploying a luxury **26-jewel specification** to maximize friction-free gear transition and utilizing Seiko's famous **Magic Lever** winding system, this caliber remains a masterpiece of robust mechanical durability.

Architectural ""8990"" Muscular Executive Case Design: The reference **6206-8990** is globally celebrated for its commanding, heavy-set case geometry. The stainless steel case features exceptionally thick, sharp lugs and an expansive polished bezel that perfectly captures the early transition toward Taro Tanaka's foundational **""Grammar of Design""** philosophy. To proudly signal to the world that manual winding was visually obsolete due to its high-efficiency automatic engineering, the time-setting **crown remains entirely recessed at the 4 o'clock position**.

Flawless ""Weekdater"" Dial Purity and Symmetry: The dial of the **6206-8990** is a masterclass in mid-century clinical clarity, showcasing a radiant silver sunburst canvas and **hand-applied, multifaceted chunky block indices**. The dual-calendar layout provides immense visual authority: a framed date aperture sits at 3 o'clock, balanced perfectly by a distinctively large, **independent arched day-of-the-week window sitting proudly at 6 o'clock**. This majestic alignment ensured split-second professional legibility during high-stakes corporate negotiations.

A Sovereign Milestone of Suwa's Automatic Legacy: Produced in the historic milestone year of **1965**, the 6206-8990 remains a highly coveted, foundational reference for serious vintage Seiko collectors worldwide. It represents the crucial historical turning point where rugged everyday durability met traditional Japanese case-finishing standards and high-jewel micro-engineering. Originally adorned with the prestigious **Dolphin or Crown etching** on the case back, it stands as a profound testament to an era when Japan perfected the high-utility executive dress watch for the global stage.

For more information, please look at the pictures.

Notes

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