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

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 : 5509116.
• Dial number : JAPAN 8305-9011T AD.
• Glass : Acrylic.
• Case size : About 37.7mm.
• Lug width : 19mm.
• Band : New Leather Strap.

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.

Key Features

The Executive Zenith of 1965 Suwa Refinement (1965): Manufactured in **1965**—a pivotal transitional year in Japanese watchmaking marking the Tokyo Olympic era and Suwa Seikosha's internal caliber restructuring—the **Seikomatic-R** reference **8305-9010** represented the pinnacle of upper-middle executive elegance. The ""R"" designation signaled a streamlined, highly refined movement architecture designed to deliver chronometer-tier thinness and automatic convenience to mid-1960s professionals.

The High-Grade Over-Engineered 30-Jewel Caliber 8305 Engine: Powering this historic dress instrument is the flagship **30-jewel Caliber 8305**, an in-house automatic movement operating at **18,000 vibrations per hour (vph)**. Engineered during an era when jewel count reflected pure mechanical prestige, this ultra-lavish **30-jewel specification** minimized friction across every critical pivot of the gear train and self-winding assembly, offering **quick-set date utility**, hacking seconds, and manual-winding capability.

Architectural ""9010"" Case and Recessed Crown Integration: Sourced in a solid stainless steel (or gold-plated) case, the reference **8305-9010** features sweeping, angular dress lugs with sharp polished bevels. Designed with Suwa’s signature **recessed crown tucked semi-flush at 4 o'clock**, the case maintains an ultra-clean, symmetrical silhouette that sits flat against the wrist and glides weightlessly under formal shirt cuffs.

Immaculate Date-Only Dial Harmony and Script Typography: The dial of the **8305-9010** showcases mid-1960s visual purity, set against a radiant silver sunburst canvas decorated with **hand-applied, multifaceted hour indices** and razor-sharp dauphine hands. Free from day-window clutter, the framed date window at 3 o'clock is perfectly balanced by the elegant applied **""SEIKOMATIC-R""** script and the bold **""30 JEWELS""** designation above 6 o'clock.

An Essential Pillar of Mid-Century Automatic Lineage: Produced during the golden age of Japanese mechanical dress watches, the 8305-9010 30-jewel Seikomatic-R stands as an indispensable, investment-grade cornerstone reference. It captures the exact bridge between early heavy-rotor automatics and the slim high-beat executive series that dominated the late 1960s.

For more information, please look at the pictures.

Notes

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