Vintage 1966 JAPAN SEIKO SEIKOMATIC-R WEEKDATER 8306-8001 30Jewels Automatic.

Welcome to my auction!
I am Japanese who live in Tokyo.

Item description

It's a SEIKO Automatic Watch, SEIKOMATIC-R WEEKDATER 8306-8001 30Jewels .
It's in good used condition.
It's difficult to find this valuable watch in such a good condition. Highly recommended for SEIKO collectors!
Movement :
  • Pet name : 83 SEIKOMATIC-R WEEKDATER.
  • Caliber number : 8306A.
  • Movement : Automatic.
  • Beat rate : 18000bph.
  • Year of manufacture start : 1965's.
  • Factory : Suwa.
Externals :
  • Serial number : 6710326.
  • Dial number : JAPAN 8306-8020T AD.
  • Glass : Acrylic.
  • Case size : About 35.4mm.
  • Lug width : 18mm.
  • 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 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 Pinnacle of Mid-60s Slim Executive Luxury (1966): Manufactured in **1966**—a defining historical year during Japan's peak post-war industrial modernization—the **Seiko Seikomatic-R Weekdater** represented the gold standard of high-society dress watchmaking. Born from the prestigious **Suwa Seikosha** factory under reference **8306-8001**, this flagship timepiece belonged to the elite ""R"" (Refined/Regis) lineage. Explicitly engineered for corporate executives, it achieved an exceptionally low-profile, comfortable wrist presence that prioritized high-fashion sophistication over bulk.
  • The Over-Engineered 30-Jewel Caliber 8306 Automatic Heart: This watch is powered by the magnificent **30-jewel Caliber 8306A**, a premium ultra-slim automatic movement operating at a classic frequency of **18,000 vibrations per hour (vph)**. In **1966**, equipping a slim dress watch with a lavish **30-jewel specification** was a monumental statement of micro-engineering prowess. Utilizing a vast array of synthetic rubies across vital gear-train pivots to minimize rotor friction, this caliber allowed Suwa to construct a remarkably flat case without compromising mechanical stability.
  • Architectural ""8001"" Low-Profile Case and Sleek Geometry: The reference **8306-8001** is globally celebrated among vintage purists for its textbook implementation of classic modernist proportions. The solid case features an extraordinarily thin bezel paired with **slender, beautifully angled lugs** finished with zero-distortion mirror polishing. Adhering to Suwa's automatic design rules, it houses a low-profile crown that lets the watch sit entirely flush against the skin, sliding completely weightless under a tailored shirt cuff.
  • Immaculate Weekdater Dial Harmony and Dual Calendar Layout: The dial of the **8306-8001** is a study in mid-century visual balance, showcasing a radiant silver sunburst canvas. It features a highly distinguished **separated dual-calendar layout**: a framed date window at 3 o'clock and a distinct, horizontally arched **day-of-the-week aperture located symmetrically above 6 o'clock**. Decorated with hand-applied, multifaceted elongated block indices, this balanced layout prioritized split-second legibility.
  • An Investment-Grade Treasure of Suwa's Slim Heritage: Manufactured in the milestone mechanical year of **1966**, the 8306-8001 30-jewel variant remains a highly coveted cornerstone reference for serious vintage Seiko collectors worldwide. It represents the perfect historical intersection where mid-1960s sharp case finishing and traditional automatic efficiency met right before the industry shifted toward higher frequencies. Built to an uncompromising heirloom standard, it stands as a profound testament to an era when Suwa perfected the luxury slim daily instrument.
    • For more information, please look at the pictures.
    Notes
    • Before buying.
      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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