Vintage Seiko Business-A 8346-8030, 27 Jewels Automatic, from December 1967

Seiko vintage mechanical watch
MADE IN JAPAN

“Seiko” (精工) is a Japanese word meaning “precision,” “exquisite workmanship,” or “refined craftsmanship.”
It comes from the characters:

• 精 (sei) – fine, precise, refined

• 工 (ko) – craft, workmanship

Originally, Seiko’s watchmaking division was called Seikosha (精工舎), meaning “House of Precision.”
The name first appeared on a watch dial in 1924, shortened from Seikosha and keeping the core meaning; the company itself was renamed Hattori Seiko in 1983 and Seiko Corporation in 1990.

So the brand name literally ties directly to the idea of precision engineering—which is exactly what the company wanted to be known for in its watches.

🕰️ Seiko Business-A overview

The Seiko Business-A line occupies a fascinating “lost chapter” in Seiko’s history. While the Seiko 5 became a global icon and the Grand Seiko reached for the stars, the Business-A was a short-lived but technically impressive series specifically designed for the rising Japanese “salaryman” class of the late 1960s.

Business-A line was created as a “Premium Daily” watch, had a notably brief and specific production window, primarily spanning from 1967 to 1969.

It served as a bridge while Seiko was moving away from the older, thicker automatic designs of the early 60s toward the high-beat, ultra-slim movements of the 1970s. Because the Lord Matic replaced it so quickly, the Business-A ran for only about three years — a short window next to long-running lines like the Seiko 5.

Comparison: Business-A vs. Seikomatic-R

You will often see the Business-A compared to the Seikomatic-R. They are essentially cousins:

• Seikomatic-R: Aimed at an older, more established demographic (more gold plating, more conservative dials).

• Business-A: Aimed at the “younger” generation (stainless steel, sharper lines, bolder dial markings).

Product Overview

Presenting a historically significant Seiko Business-A, reference 8346-8030. Produced by the prestigious Suwa Seikosha factory in the late 1960s, the Business-A line was Seiko’s premier offering for the rising Japanese professional class. This model sits perfectly between the utilitarian Seiko 5 and the high-luxury King Seiko, offering a blend of robust engineering and restrained, well-proportioned dress-watch styling.

Technical Excellence: The 8346 Caliber

Unlike many vintage Seikos of this era, the Caliber 8346A features a sophisticated 27-jewel movement that allows for manual hand-winding in addition to its efficient automatic winding. This ensured the watch stayed powered even during periods of low activity — a practical safeguard built into the movement, not a market-specific feature.

Design & Aesthetics

• Dial: Stunning original sunburst silver dial featuring the iconic “Business-A” script and a clean, unadorned layout that exudes mid-century technical precision.

• Case: Sharp, stainless steel geometry with a 36 mm case (excluding crown) that wears larger thanks to its thin bezel and expansive dial.

• Complications: A date window at 3 o’clock plus a separate day aperture at 6, reflecting its functional heritage as a “business” tool.

• Condition: This example has been fully serviced, ensuring the movement is clean, regulated, and keeping excellent time. The case retains its original factory lines, and the dial remains remarkably preserved.

Specifications

• Brand: Seiko

• Model: Business-A

• Reference: 8346-8030

• Movement: Caliber 8346A Automatic (27 Jewels)

• Features: Manual Winding, Diashock Protection, Day/Date Complication

• Case Material: Stainless Steel

• Case Diameter: Approx. 36 mm (excluding crown)

• Era: Late 1960s (JDM)

• Service History: Fully Serviced (2026)

Collector’s Note: The Business-A is increasingly sought after by Seiko enthusiasts for its shorter production run and its unique position as the “bridge” to the Lord Matic series. Finding an example with a clean dial and a recently serviced 83-series movement is what makes this example worth a look for any vintage horology collection.

This watch has recently been serviced by a professional watchmaker and keeps good time.

Comes complete with original steel bracelet*.

(*)Note: Stock bracelets are often shortened by previous owners and may not fit you(see bracelet size in the product images). We match the strap to this watch’s lug width, so there is nothing for you to measure — just pick a padded leather strap for Seiko from the options at the top of the page.

Modes of payment:

• PayPal
• Credit Cards (VISA, MasterCard, American Express, Discover)
• bitcoin

We guarantee the item you receive looks and works exactly as advertised — or your money back.

Seiko Group Corporation (セイコーグループ株式会社, Seikō Gurūpu kabushiki gaisha), commonly known as Seiko, is a Japanese maker of watches, clocks, electronic devices, and semiconductors. Founded in 1881 by Kintarō Hattori in Tokyo, Seiko introduced the world’s first commercial quartz wristwatch in 1969.

Seiko is widely known for its wristwatches. Seiko is one of the few watch companies that is fully vertically integrated. Seiko is able to design and develop all the components of a watch, as well as assemble, adjust, inspect and ship them in-house. Seiko’s mechanical watches consist of approximately 200 parts, and the company has the technology and production facilities to design and manufacture all of these parts internally.

Seiko offers one of the widest ranges of watch technologies in the world—quartz, kinetic, solar, mechanical, and Spring Drive—spanning everything from affordable everyday pieces to six-figure haute horlogerie. Over the decades it has launched multiple global brands, including Lorus, Pulsar, and Alba, while elevating its prestige through innovations like Spring Drive, which helped push Seiko into higher-end territory. In 2017, Grand Seiko was spun off into its own standalone luxury brand, while Credor remains part of Seiko’s own lineup, sold primarily in Japan. Seiko’s own global lineup now includes Grand Seiko, King Seiko, Prospex, Astron, Presage, and Seiko 5 Sports.

Among Seiko’s key lines, Seiko 5 (born in 1963) is the gateway mechanical series known for durability and value; Lord Matic defined 1970s style with faceted crystals and colorful dials; Astron remains Seiko’s flagship GPS-solar tech line; Presage focuses on traditional mechanical craftsmanship with enamel and urushi dials; and Prospex delivers professional-grade dive, field, and pilot watches often embraced by enthusiasts. At the top end, Grand Seiko emphasizes precision, Zaratsu polished design, and movements like Spring Drive, while King Seiko—revived in the 2020s—brings back sharp, elegant 1960s styling with modern calibres.

Finally, Credor represents Seiko’s pinnacle of artisanal watchmaking, producing low-volume pieces in precious metals and showcasing Japanese decorative arts and haute complications from the Micro Artist Studio. Beyond watches, Seiko has also produced various electronic devices and, historically, jewelry and eyewear—though those divisions have since shifted to other companies.