Vintage 1966 JAPAN SEIKO SEIKOMATIC-R 8305-8010 30Jewels Automatic. For Sale

Vintage 1966 JAPAN SEIKO SEIKOMATIC-R 8305-8010 30Jewels Automatic.

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

Item descriptionIt\'s a SEIKO Automatic Watch, SEIKOMATIC-R 8305-8010 30Jewels .
It\'s in good used condition.
It\'s difficult to find this valuable watch in such a good condition.Highly recommended for SEIKO collectors!Movement :

• Pet name : 83 SEIKOMATIC-R.
• Caliber No. : 8305C.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1965\'s.
• Factory : Suwa.

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.
• Overhaul service in September 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

The Sovereign Peak of Mid-60s Refined Executive Luxury (1966): Manufactured in **1966**—a milestone historical year during Japan\'s high-growth economic boom and horological golden era—the **Seiko Seikomatic-R** reference **8305-8010** represented Suwa Seikosha\'s elevated dress watch platform. Bearing the prestigious **\"\"R\"\"** (\"\"Refined\"\") moniker, this high-grade reference served as the flagship date-only executive timepiece bridging the Seikomatic line with top-tier King Seiko models.

The Over-Engineered 30-Jewel Caliber 8305 Automatic Engine: Powering this historic instrument is the revered **30-jewel Caliber 8305A**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Equipping a dress watch in **1966** with an extraordinary **30-jewel specification** minimized friction across critical gear-train pivots, delivering exceptional long-term rate stability while featuring **hacking seconds** and quick-set date operation.

Architectural \"\"8010\"\" Classic Dress Case and Recessed Crown Integration: Sourced in a solid stainless steel case, the reference **8305-8010** is globally recognized for its sharp, broad-shouldered case architecture. Adhering to early **\"\"Grammar of Design\"\"** principles with sweeping lug chamfers and broad zero-distortion mirror-polished bevels, the low-profile case integrates a signature **recessed crown at 4 o\'clock** for an uninterrupted, symmetrical wrist silhouette.

Immaculate Date-Only Dial Harmony and High-Jewel Typography: The dial of the **8305-8010** is a study in mid-century visual restraint and high-contrast clarity. Free from day-window clutter, it features a radiant silver sunburst canvas set with **hand-applied, multifaceted rectangular hour indices** and sharp dauphine hands, neatly balanced by the framed date aperture at 3 o\'clock and the stylized **\"\"Seikomatic-R 30 Jewels\"\"** designation above 6 o\'clock.

The Sovereign Gold Dolphin Case Back Medallion Heritage: The ultimate hallmark of this 1966 treasure 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 8305-8010 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

• 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.
  
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