Vintage 1967 JAPAN SEIKO BUSINESS-A WEEKDATER 8306(46)-8020 27Jewels Automatic.

Vintage 1967 JAPAN SEIKO BUSINESS-A WEEKDATER 8306(46)-8020 27Jewels Automatic.

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

Item description

Movement :

• Pet name : 83 BUSINESS-A WEEKDATER.
• Caliber number : 8306A.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1965's.
• Factory : Suwa.

Externals :

• Serial number : 7525847.
• Dial number : JAPAN 8346-8030T AD.
• Glass : Acrylic.
• Case size : About 35mm.
• Lug width : 18mm.
• Band : New Leather Strap.

Condition :

• Used, it runs well.
• ONE PIECE CASE
  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 10:00 and 1:00
• 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 Mid-60s Business Class Luxury (1967): Manufactured in **1967**—a landmark year during Japan's high-growth economic miracle—the **Seiko Business-A (Business Automatic)** represented Suwa Seikosha's dedicated line engineered specifically for rising corporate executives. Sourced under reference **8306-8020** (also cataloged with movement designation **46**), this high-grade mid-1960s model offered a sophisticated bridge between the Seikomatic-R series and the upper-tier Lord Matic lineup.

The Over-Engineered 27-Jewel Caliber 8306 Automatic Heart: Powering this historic timepiece is the revered **27-jewel Caliber 8306A**, an in-house automatic engine operating at a steady frequency of **18,000 vibrations per hour (vph)**. Equipping an executive watch in **1967** with an ultra-high **27-jewel specification** minimized friction across critical gear-train pivots. This movement features modern executive conveniences including **hacking seconds**, quick-set date operation, and smooth manual-winding capability.

Architectural ""8020"" Case Geometry and Low-Profile Lines: The reference **8306-8020** is globally distinguished among vintage collectors for its classic, broad-shouldered stainless steel case architecture. Designed with sharp, faceted lugs and sweeping, zero-distortion mirror-polished bevels adhering to early **""Grammar of Design""** principles, the low-profile case allows the watch to slide effortlessly under a tailored shirt cuff.

Masterful ""Weekdater"" Dial Harmony and Executive Clarity: The dial of the **8306-8020** showcases outstanding visual balance, featuring a radiant silver sunburst canvas decorated with **hand-applied, multifaceted rectangular hour indices**. Symmetrically framed at 3 o'clock, the dual-calendar window houses a full day-of-the-week display alongside the date wheel, proudly signed with the stylized applied **""Business-A""** logo and **""27 JEWELS""** typography above 6 o'clock.

An Investment-Grade Masterpiece of Suwa's Executive Legacy: Manufactured in the milestone mechanical year of **1967**, the 8306-8020 27-jewel Business-A remains a highly coveted, universally respected cornerstone reference for vintage Seiko collectors. It captures the exact historical era where Seiko created specialized executive lines for Japan's emerging corporate leaders, built to an uncompromising, heirloom-grade standard.

For more information, please look at the pictures.

Notes

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