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

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

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

Item description

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 : 6802047.
• Dial number : JAPAN 8306-8010T AD.
• Glass : Acrylic.
• Case size : About 35.5mm.
• Lug width : 18mm.
• Band : Wrist size that can be worn is Up to about 205mm.

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 Sovereign Peak of Mid-60s Business Automatic Luxury (1966): Manufactured in 1966—a landmark historical year defined by Japan's post-war economic boom and technological leadership in watchmaking—the Seiko Seikomatic-R Weekdater reference 8306-8001 represented Suwa Seikosha's elevated business-class automatic series. Positioned above standard Seikomatic models, the ""R"" (Refined) designation signified superior movement finishing, ultra-thin case profiling, and executive sophistication during the golden Showa era.
• The Over-Engineered 30-Jewel Caliber 8306 Automatic Heart: Powering this historic timepiece is the celebrated 30-jewel Caliber 8306A, an in-house automatic engine operating at 18,000 vibrations per hour (vph). Equipping an automatic watch in 1966 with an expansive 30-jewel specification was a bold statement of micro-engineering luxury, utilizing synthetic rubies across gear-train pivots to minimize mechanical friction. It features manual-winding capability, a quick-set date function, and Seiko's Diashock anti-shock protection system.
• Architectural ""8001"" Case Geometry and Recessed Crown: Sourced in a solid stainless steel case, the reference 8306-8001 is globally recognized among vintage collectors for its sleek executive proportions. Executed with sharp, faceted lugs and mirror-polished bevels inspired by Taro Tanaka's early ""Grammar of Design"" guidelines, it features Suwa's signature recessed crown hidden at 4 o'clock, allowing the thin case silhouette to rest completely flush against the wrist.
• Masterful ""Weekdater"" Dial Harmony and Fine Typography: The dial of the 8306-8001 showcases exemplary mid-century visual balance, featuring a radiant silver sunburst canvas set with hand-applied, multifaceted rectangular block indices and sharp dauphine hands. Symmetrically framed, it displays a distinct day calendar aperture paired with a framed date window at 3 o'clock, proudly adorned with applied ""SEIKOMATIC-R"" script and the ""30 JEWELS"" designation.
• The Sovereign Dolphin Case Back Medallion Heritage: The ultimate hallmark of this 1966 vintage treasure sits stamped on the case back: the iconic Seiko Dolphin crest (or deeply etched waterproof dolphin medallion). Certifying its factory-regulated precision and water-resistant construction, the 8306-8001 Seikomatic-R stands as an essential, investment-grade cornerstone reference for serious vintage Seiko collectors worldwide.

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.
  
  
• To prevent shipping accidents.
  Please monitor the tracking number until the item arrives and if it stagnates, please investigate at your country post office. Also, please confirm the item when you receive the item.
  
  
• About import taxes.
  Taxes such as import duties and VAT are not included in the item price or shipping charges, except for items shipped to the US. When you purchase, you will likely be required to pay these fees in your country.
  
  
• About Payment, Shipping, Return.
  Payment, Shipping, Return are in accordance with eBay's business policies.