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.”
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.
About the SilverWave Line
The Seiko SilverWave was Seiko’s line of water-resistant sports watches, first introduced in the early 1960s and still in the catalogue through the 1970s. The name captured the whole idea in two words — a bright, polished steel case (“Silver”) engineered to keep water out (“Wave”). It was the Seiko you never had to take off: at the poolside, caught in the rain, or simply worn day in and day out.
Where the Sportsmatic and later Seiko 5 lines chased the affordable everyday automatic, the SilverWave staked out the water-resistant corner of the catalogue. Its cases were fully sealed with screw-type case-backs and gaskets, stamped “WATER RESIST” on the reverse, and the sportier references in the family were built as genuine divers. It was the accessible, water-ready Seiko for the buyer who wanted a single watch for work, weekend and water alike.
By the mid-1970s the line had moved onto Seiko’s rugged 63-series automatics — the 21-jewel caliber 6306A for the Japanese domestic market, with its English/Kanji day wheel and hacking seconds, alongside the 6309 export equivalent. These were dependable, self-winding day-date movements built in the hundreds of thousands. Wrapped in the faceted, cushion-edged steel cases and the matte, brushed and textured dials of the era, the 6306 SilverWaves are exactly the kind of characterful, over-built 1970s Seiko that collectors have been quietly rediscovering.
About This Watch
This is a Seiko SilverWave, reference 6306-8070, dated to July 1978 by the serial number (878272) engraved on its case-back. It pairs a flat black dial with applied baton markers, a framed day-date at 3 o’clock (the day wheel is bilingual English and Kanji), and the flowing “SilverWave” script above six — all set beneath a faceted stainless-steel cushion case with a polished bezel.
Inside is Seiko’s caliber 6306A: a 21-jewel automatic beating at 21,600 vibrations per hour, with hacking seconds and a quickset day-date. It is one of the more capable of Seiko’s 1970s workhorse movements — the very same caliber Seiko fitted to the Japanese-market version of its celebrated “turtle” divers. The case-back is stamped WATER RESIST, true to the SilverWave’s water-ready remit, and the watch comes fitted on a padded black leather strap with contrast stitching.
Technical Specifications
- Brand: Seiko
- Line: SilverWave
- Reference Number: 6306-8070
- Movement: Caliber 6306A, automatic (self-winding) — 21 jewels, 21,600 vph, hacking seconds, quickset day-date
- Serial Number: 878272
- Production Date: July 1978
- Case Material: Stainless steel
- Case Diameter: approx. 38 mm (excluding crown)
- Dial: Flat black with applied baton markers; day-date at 3 o’clock
- Crystal: Seiko Hardlex
- Case-back: Stainless steel, screw-type, marked “WATER RESIST-G”
- Country of Manufacture: Japan
Condition Report
The flat black dial presents cleanly — even and unmarked, with all applied markers intact and the “SilverWave” and day-date printing crisp; the lume plots and hands have aged to a warm, even cream. The faceted stainless-steel case shows honest light wear from four-plus decades of use — a few scattered surface marks and some softening of the high polish on the bezel and lugs — but stays sharp and well defined, with no dents or corrosion. The Hardlex crystal is clear and the day and date both change cleanly. It is fitted on a padded black leather strap with contrast stitching.
This watch has recently been serviced by a professional watchmaker and keeps good time.
Comes fitted on a padded black leather strap with contrast stitching.
Note: The strap is a quality aftermarket leather strap. We match the strap to this watch’s lug width, so there is nothing for you to measure — just pick a padded leather strap from the options at the top of the page.
This watch ships from 🇺🇦 Ukraine with tracking number
Why Collectors Want This Watch Today
The SilverWave runs the same 21-jewel 6306A automatic that Seiko fitted to its Japanese-market 6306-7001 diver, in a slimmer, dressier case. Seiko built the 6306-80xx SilverWaves in quantity through the late 1970s and clean examples still come up regularly, so what this one offers is the movement and the build rather than scarcity.
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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 — 18 / 19 / 20 mm
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 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.
