Vintage 1967 JAPAN SEIKO BUSINESS-A 8306-9030 30Jewels Automatic.

Vintage 1967 JAPAN SEIKO BUSINESS-A 8306-9030 30Jewels Automatic.

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

Item description

Movement :

• Pet name : BUSINESS-A.
• Caliber number : 8306A.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1965's.
• Factory : Suwa.

Externals :

• Serial number : 7125365.
• Dial number : JAPAN 8306-9040R AD.
• Glass : Acrylic.
• Case size : About 37.49mm.
• Lug width : 19mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week : English only.
  Set of the date : The set at one stage pulling the crown.
  Set of the week : Iteration the hour hand at 9:00 and 12:00.
• 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 Sovereign Peak of 1967 Corporate Executive Luxury (1967): Manufactured in **1967**—a landmark year during Japan's high-growth economic miracle—the **Seiko Business-A (Business Automatic)** reference **8306-9030** represented Suwa Seikosha's premium executive dress watch line. Created specifically for senior managers and corporate leaders, this high-jewel iteration delivered an exceptional balance of refined aesthetic detail and sophisticated automatic engineering.

The Over-Engineered Ultra-High 30-Jewel Caliber 8306 Engine: Powering this historic timepiece is the rare, top-tier **30-jewel Caliber 8306A**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Pushing mechanical luxury to its upper limits, the extraordinary **30-jewel count** provided maximum synthetic ruby protection across gear-train pivots and rotor components, while featuring **hacking seconds**, quick-set date control, and manual-winding capability.

Architectural ""9030"" Broad-Shouldered Case Geometry: Sourced in a solid stainless steel case, the reference **8306-9030** features a classic mid-1960s dress profile with sweeping lug chamfers and broad zero-distortion mirror-polished bevels. Built in accordance with early **""Grammar of Design""** principles, the low-profile case integrates clean lines engineered to slide seamlessly under formal dress shirts.

Masterful Executive Calendar Dial Layout and High-Jewel Branding: The dial of the **8306-9030** exhibits outstanding visual balance, displaying a radiant silver sunburst canvas set with **hand-applied, multifaceted rectangular hour indices**. The distinct calendar aperture layout displays a clear date wheel alongside day functionality, perfectly offset by the script **""Business-A""** logo and the prominent **""30 JEWELS""** designation above 6 o'clock.

An Investment-Grade Masterpiece of Suwa's Business-A Lineage: Produced during the prime mechanical manufacturing year of **1967**, the 8306-9030 30-jewel Business-A stands as an uncommonly high-grade, universally respected cornerstone reference for vintage Seiko purists. It captures the exact historical moment where Seiko crafted purpose-built luxury watches for Japan's rising corporate elite.

For more information, please look at the pictures.

Notes

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