Description
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.”
In 1924 the company shortened the name to Seiko, keeping the core meaning.
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.
About the Business-A Line
The Seiko Business-A was introduced in the late 1960s as the direct successor to the Seikomatic-R — Seiko’s slim, sophisticated dress watch for the emerging Japanese salaried professional class.
By the late 1960s, the Seikomatic-R had already established the template: a slim 83-series movement, day-date complication, clean round case, and the understated elegance of a watch that disappeared under a shirt cuff. The Business-A carried this formula forward with the refined 83-series calibers — automatic movements with Diashock shock protection running at 18,000 bph — while updating the aesthetic to match the tastes of the new decade.
The name was deliberately straightforward: “Business” for the white-collar audience it served, “A” for automatic. No clever portmanteau — just a clear statement of purpose for the dress watch of Japan’s post-war business generation.
The 83-series calibers powering the Business-A were a genuine step up from entry-level Seiko offerings: 27 to 30 jewels when most mid-market automatics offered 17–21, with Diashock protecting the balance staff through decades of daily wear. Day-date quickset at 3 o’clock added practical utility without cluttering the dial.
The Business-A occupies the sweet spot between the Seiko 5 (entry-level) and the King Seiko (luxury) — offering genuine professional-grade horology at a price the secondary market hasn’t fully caught up with. Finding examples with their period expansion bracelets intact is increasingly rare, as most have been lost to broken links or swapped straps over the decades.
About This Watch
This is a Seiko Business-A, reference 8346-7000, powered by the automatic caliber 8346A — a 27-jewel, 18,000 bph day-date movement with Seiko’s Diashock protection. Its serial number, 931089, dates production to March 1969, near the height of the Business-A’s run as Seiko’s everyday dress automatic for the Japanese professional.
The silver sunburst dial is the highlight: clean applied baton markers, a discreet framed day-date window at 3 o’clock, the applied SEIKO logo, and an understated “BUSINESS-A / DIASHOCK 27 JEWELS” signature. The stainless steel case has the soft, rounded late-1960s silhouette meant to slip under a shirt cuff, and it wears on a period Milanese mesh bracelet. Everything about it is deliberately restrained — a watch built to be worn every day without ever drawing attention to itself.
Technical Specifications
- Brand: Seiko
- Line: Business-A
- Reference Number: 8346-7000
- Movement: Seiko caliber 8346A, automatic, 27 jewels, 18,000 bph, day-date
- Serial Number: 931089
- Production Date: March 1969
- Case Material: Stainless steel
- Case Diameter: 37 mm (excluding crown), ~42 mm lug-to-lug, 18 mm lug width
- Dial: Silver sunburst with applied baton markers and framed day-date window at 3 o’clock
- Crystal: Acrylic
- Case-back: Stainless steel, marked “8346-7000” and “WATER PROOF”
- Country of Manufacture: Japan
Condition Report
The silver sunburst dial is clean and bright, with strong sunburst finishing and no notable blemishes; the applied markers and SEIKO logo are intact and the printing is crisp. The hands are straight and the day and date discs advance correctly (day displayed in English). The stainless steel case shows only light, honest wear from careful use, with its brushed and polished surfaces still well defined and the case-back markings sharp. The acrylic crystal is clear. It comes on its period Milanese mesh bracelet, which is supple and wears comfortably — see the sizing image for its fitted length.
Watch went through a recent service by a professional watch technician and keeps good time.
Comes complete with vintage steel bracelet*.
(*)Note: Stock bracelets are often shortened by previous owners and may not fit you(see bracelet size in the product images). We recommend adding a new Seiko lug width matched leather strap with your order.
This watch ships from 🇺🇦Ukraine with tracking number
Why Collectors Want This Watch Today
The Business-A sits in a genuinely appealing spot in Seiko’s vintage hierarchy — a clear step above the entry-level Seiko 5, with a 27-jewel automatic movement and day-date complication, yet still priced well below the King Seiko and Grand Seiko lines it shares an era with. For collectors who want honest 1960s Japanese watchmaking in a wearable, understated dress format, it is one of the best-value ways in.
Clean silver sunburst examples like this one, with an original dial and an intact period mesh bracelet, are getting harder to find in genuinely wearable condition — over five decades most have had their dials refinished or their bracelets swapped. A crisp, freshly serviced example that presents this well is increasingly the exception rather than the rule.
Modes of payment:
- PayPal
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We guarantee the item you receive looks and works exactly as advertised — or your money back.
Seiko lug width matched leather straps: 18mm - 19mm - 20mm
About the watch factory
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 and Rolex are the only two watch companies considered to be 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 the 2010s, Grand Seiko and Credor were separated into fully independent luxury brands, while Seiko’s own global lineup now includes Grand Seiko, King Seiko, Prospex, Astron, Presage, and Seiko 5 Sports, with Credor remaining primarily Japan-focused.
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.
