Serviced Vintage 1965 JAPAN SEIKO SEIKOMATIC-R 8305-9010 30Jewels Automatic.

Serviced Vintage 1965 JAPAN SEIKO SEIKOMATIC-R 8305-9010 30Jewels Automatic.

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

Item description

Movement :

• Pet name : SEIKOMATIC-R.
• Caliber number : 8305B.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1963's.
• Factory : Suwa.

Externals :

• Serial number : 5405560.
• Dial number : JAPAN 8305-9011T AD.
• Glass : Acrylic.
• Case size : About 38mm.
• Lug width : 19mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• Set of the date : The set at one stage pulling the crown.
• The day difference time of an used watch is about +-1 minute / day.
• Overhaul service in August 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

The Sovereign Benchmark of Mid-60s Executive Refinement (1965): Manufactured in **1965**—a milestone historical year during Japan's rapid post-war economic modernization and horological ascendancy—the **Seiko Seikomatic-R 8305-9010** represented the elite flagship tier of Suwa Seikosha's executive line. Designated by the iconic **""R""** moniker for ""Refined,"" this luxury dress timepiece was engineered to deliver ultra-slim automatic elegance paired with high-grade internal mechanical finishing.

The Over-Engineered 30-Jewel Caliber 8305 Automatic Heart: Powering this historic instrument is the highly coveted **30-jewel Caliber 8305A**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Equipping an executive dress watch in **1965** with a lavish **30-jewel specification** was a monumental statement of micro-engineering luxury. Utilizing synthetic rubies across gear-train pivots to minimize rotor friction, it features **hacking seconds** and smooth manual-winding capability.

Architectural ""9010"" Fluted Ring and Low-Profile Case Geometry: The reference **8305-9010** is globally distinguished among vintage purists for its distinct **fluted inner bezel chapter ring** framing the dial. The solid stainless steel case features slender, sharp-faceted lugs finished with zero-distortion mirror polishing. Designed with an ultra-thin bezel profile and recessed crown at 4 o'clock, it sits completely flush against the wrist, sliding effortlessly under a formal shirt cuff.

Immaculate Date-Only Dial Balance and Visual Clarity: The dial of the **8305-9010** is a masterclass in mid-century visual restraint and high-contrast clarity. Free from day-window clutter, it showcases a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular block indices** and razor-sharp hands. Symmetrically framed at 3 o'clock, the quick-set date window provides instant legibility, proudly signed with **""SEIKOMATIC-R""** and **""30 JEWELS""** typography above 6 o'clock.

The Sovereign Gold Dolphin or Engraved Case Back Heritage: The ultimate hallmark of this 1965 treasure sits proudly on the case back: the iconic **embossed gold or deeply engraved Seiko Dolphin crest**. This emblem historically certified its factory-regulated precision standard and water-resistant case construction. Built to an uncompromising heirloom quality, the 8305-9010 30-jewel Seikomatic-R stands as an eternal, investment-grade cornerstone reference for serious vintage Seiko collectors worldwide.

For more information, please look at the pictures.

Notes

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