Vintage 1967 JAPAN SEIKO BUSINESS-A 8346-8000 27Jewels Automatic.

Vintage 1967 JAPAN SEIKO BUSINESS-A 8346-8000 27Jewels Automatic.

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

Item description

Movement :

• Pet name : BUSINESS-A .
• Caliber number : 8346A.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1966's.
• Factory : Suwa.

Externals :

• Serial number : 7147017.
• Dial number : JAPAN 8346-8011T AD.
• Glass : Acrylic.
• Case size : About 36.72mm.
• Lug width : 18mm.
• Band : Wrist size that can be worn is Up to about 204mm.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week : English only.
  Set of the days of the week : Iteration the hour hand at 9:00 and 1:00.
  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 ""Business-Ace"" Professional Evolution (1967): In **1967**, the **Seiko Business-A (Ace)** was introduced to capture the spirit of Japan’s rapidly modernizing corporate culture. The reference **8346-8000** was produced by the **Suwa Seikosha** factory as a sophisticated bridge between utilitarian sports models and elite luxury lines. It arrived as a dedicated instrument for the ""Business"" class, prioritizing a slim, dignified aesthetic that complemented the crisp suits and high-stakes meetings of the late-Showa era.

The High-Grade 27-Jewel Caliber 8346 Heart: This watch is powered by the **27-jewel Caliber 8346**, a refined automatic movement operating at **18,000 vibrations per hour (vph)**. In **1967**, the **27-jewel count** was a prestigious specification, utilizing synthetic rubies to minimize friction in the day-date calendar gear train and the winding system. This caliber was part of the celebrated 83-series, which focused on a low-profile, ""slender"" architecture to ensure the watch sat elegantly and discreetly against the wrist.

Architectural ""8000"" Grammar of Design: The reference **8346-8000** is a definitive example of early **Seiko Style**. The case features sharp, mirror-polished lugs and a narrow bezel that emphasizes the dial’s expanse. A signature trait is the **crown recessed at the 4 o'clock position**, which was a visual signal of Suwa’s engineering pride—communicating that the automatic winding was so efficient that manual intervention was unnecessary, allowing the sleek symmetry of the case to remain uninterrupted.

Masterful ""Weekdater"" Dial Harmony: The dial of the **8346-8000** is a study in clinical luxury, featuring a radiant sunburst silver finish and **hand-applied, multifaceted baton indices**. The dual-calendar window at 3 o'clock houses the day and date, providing essential information for the professional executive. The applied **""Business-A"" script** and the Suwa factory symbol remain iconic hallmarks of this era’s high-status branding, prioritizing sophisticated clarity and professional discipline.

A Landmark of Showa-Era Horological Art: Produced in **1967**, the Business-A 8346-8000 remains a highly sought-after reference for collectors who value the ""slender"" mechanical era. It represents the ""Golden Age"" of the 83-series, combining **mechanical complexity with a timeless, formal aesthetic**. It stands as a testament to an era when Seiko focused on bringing high-end horological features—once reserved for the few—to the wrists of a new generation of ambitious global professionals.

For more information, please look at the pictures.

Notes

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