Vintage 1967 JAPAN SEIKO SEIKOMATIC-R 8305-8031 30Jewels Automatic.

Vintage 1967 JAPAN SEIKO SEIKOMATIC-R 8305-8031 30Jewels Automatic.

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

Item description

Movement :

• Pet name : 83 SEIKOMATIC-R.
• Caliber number : 8305C.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1965's.
• Factory : Suwa.

Externals :

• Serial number : 7D2087.
• Dial number : JAPAN8305-8030TAD.
• Glass : Acrylic.
• Case size : About 35.5mm.
• Lug width : 18mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• ONE PIECE CASE.
  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 Pinnacle of Late-60s Ultra-Thin Luxury (1967): In **1967**—a landmark historical year defined by Japan's peak post-war industrial confidence and rapid modernization—the **Seiko Seikomatic-R** stood as the absolute standard of elegant executive wear. Produced by the **Suwa Seikosha** factory under reference **8305-8031**, this high-end model was engineered for corporate leaders who demanded exceptional mechanical prestige. Representing the elite ""R"" (Regis/Refined) lineage, it offered an incredibly flat, comfortable profile that prioritized high-society sophistication over everyday utility.

The Over-Engineered 30-Jewel Caliber 8305 Automatic Heart: This watch is powered by the magnificent **30-jewel Caliber 8305**, a premium ultra-slim automatic movement operating at a classic frequency of **18,000 vibrations per hour (vph)**. In **1967**, deploying an incredibly lavish **30-jewel specification** for a dress watch was a massive statement of micro-engineering prowess. Utilizing a vast array of synthetic rubies to secure the gear-train pivots and minimize auto-winding friction, this caliber allowed Suwa to construct a remarkably thin case without sacrificing mechanical stability.

Architectural ""8031"" Low-Profile Minimally Faceted Case Geometry: The reference **8305-8031** is highly 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 straight lugs** finished with zero-distortion mirror polishing. This low-slung, ultra-low center-of-gravity geometric structure allowed the watch to sit entirely flush against the skin, sliding completely weightless and effortlessly under a tailored executive shirt cuff.

Immaculate Dial Clarity and Calendar Refinement: The dial of the **8305-8031** is a study in clinical mid-century luxury, showcasing a radiant silver sunburst canvas decorated with **hand-applied, multifaceted elongated block indices**. The clean, uncompromised face features a beautifully framed date window at 3 o'clock, creating a perfect visual balance. The dial is proudly signed with the iconic, stylized cursive **""Seikomatic-R"" script**, guaranteeing its elite internal engineering pedigree.

An Investment-Grade Masterpiece of Suwa's Elegant Legacy: Manufactured in the milestone mechanical year of **1967**, the 8305-8031 30-jewel variant remains a highly coveted cornerstone reference for serious vintage Seiko collectors worldwide. It represents the perfect historical intersection where rugged daily durability met late-1960s sharp case finishing and traditional automatic efficiency 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 instrument.

For more information, please look at the pictures.

Notes

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