Vintage 1965 JAPAN SEIKO SEIKOMATIC-R 8305-0020 30Jewels Automatic.

Vintage 1965 JAPAN SEIKO SEIKOMATIC-R 8305-0020 30Jewels Automatic.

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

Item description

Movement :

• Pet name :SEIKOMATIC-R .
• Caliber number : 840.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1963's.
• Factory : Suwa.

Externals :

• Serial number : 5601683.
• Dial number : JAPAN 8305-0011TAD.
• Glass : Acrylic.
• Case size : About 37.5mm.
• Lug width : 19mm.
• Band : New Leather Strap of SEIKO original.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay. 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.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.
• The movement may have been replaced.

Key Features

The Sovereign Benchmark of 1965 Executive Refinement (1965): Manufactured in **1965**—a pivotal historical year during Japan's rapid economic expansion and horological golden age—the **Seiko Seikomatic-R** represented Suwa Seikosha's upper-tier automatic dress watch line. Sourced under reference **8305-0020**, this high-grade ""R"" (Refined) model served as the quintessential executive dress timepiece, bridging the gap between everyday automatics and top-tier King Seiko references.

The Over-Engineered 30-Jewel Caliber 8305 Automatic Heart: Powering this historic instrument is the revered **30-jewel Caliber 8305A**, an in-house automatic engine operating at a classic frequency of **18,000 vibrations per hour (vph)**. Equipping a dress watch in **1965** with a lavish **30-jewel specification** drastically reduced gear-train pivot wear, delivering exceptional long-term rate stability while incorporating **hacking seconds** and quick-set date operation.

Architectural ""0020"" Dress Case Geometry and Low-Profile Lines: The reference **8305-0020** is globally distinguished among vintage Seiko collectors for its classic, broad-shouldered stainless steel case architecture. Featuring sweeping lug shoulders, razor-sharp facets, and a signature **recessed crown at 4 o'clock**, the low-profile case maintains an ultra-sleek silhouette that glides effortlessly under a tailored shirt cuff.

Immaculate Date-Only Dial Symmetry and High-Jewel Branding: The dial of the **8305-0020** is a study in mid-century visual restraint and high-contrast legibility. Free from day-window clutter, it displays a radiant silver sunburst canvas set with **hand-applied, multifaceted rectangular hour indices** and sharp dauphine hands, perfectly balanced by the framed date window at 3 o'clock and the stylized **""Seikomatic-R""** typography above 6 o'clock.

The Sovereign Gold Dolphin Case Back Medallion Heritage: The ultimate seal of quality rests on the case back: the iconic **solid gold-embossed or deeply engraved Seiko Dolphin medallion**. Certifying its elite factory-regulated precision and water-resistant construction, the 8305-0020 30-jewel Seikomatic-R stands as an eternal, investment-grade cornerstone reference for serious vintage watch collectors worldwide.

For more information, please look at the pictures.

Notes

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