Description
SEIKO vintage quartz 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 and into the 1980s. 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 RESISTANT” 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 1980 the line had crossed into the electronic era, and the SilverWave name was applied to an “ana-digi” — a watch carrying a real analog dial and a liquid-crystal display side by side on the same face. The caliber H239 drove a small motor-driven analog sub-dial for the time at a glance, while the LCD panel beneath it handled everything else — the digital time, the calendar, a second time zone, an alarm and a stopwatch. The H239 ana-digis are widely sold as “Robot” watches, a name most closely tied to the robot-faced H239-5020.
About This Watch
This is the Seiko SilverWave ana-digi, reference H239-5040 — the Japanese-domestic-market model collectors know as the “Robot” SilverWave. Its case-back serial, 0O7966, dates it to October 1980, the year the H239-5040 was released.
The face is the whole point of this watch. A brushed steel bezel sits above a deep black dial printed with the cursive SilverWave script and, below it, the function legend — LOCK, CALENDAR, ALARM, DUAL T., SET, and the chronograph’s START / STOP / RESET in pale blue — laid out like a control panel. The upper right of the dial carries a small silvered analog sub-dial marked QUARTZ, with baton markers and its own set of hands; directly beneath it sits the rectangular LCD panel showing hours, minutes, seconds and the AM/PM indicator. One pusher on each flank of the case, labelled B on the left and A on the right, drives the digital functions, while the crown at 2 o’clock sets the analog hands.
The case is stainless steel, squared and deeply faceted with exposed screws at each corner and a recessed slotted panel above the dial. The screw-type case-back is stamped with the Silver Wave logo, the reference, and WATER RESISTANT STAINLESS STEEL JAPAN. It comes on its original steel Seiko bracelet with a signed SEIKO fold-over clasp.
How it works: the two pushers are marked A and B.A cycles the LCD through its displays in turn — time, calendar, alarm, dual (local) time and stopwatch. To set any of them, hold B for three to four seconds until part of the display flashes with a chime; each further press of B steps to the next field, and A advances the flashing value. The analog side is set separately and electronically rather than by hand: with the crown pulled to its first click, one click either way shifts the hands 30 seconds, and two clicks within half a second shifts them a full hour. The watch also chimes on the hour if you want it to, times to a tenth of a second over 30 minutes, and flashes every digit at once when the battery runs low. Seiko’s original technical guide for the caliber is still available online — Cal. H239A Technical Guide (PDF) — if you want the full factory reference.
Technical Specifications
- Brand: Seiko
- Line: SilverWave (Ana-Digi, “Robot”)
- Reference Number: H239-5040
- Movement: Seiko caliber H239A quartz, 2 jewels — analog display plus LCD, with calendar, dual time, alarm and chronograph
- Serial Number: 0O7966
- Production Date: October 1980
- Case Material: Stainless steel
- Case Diameter: Approx. 36 mm (excluding crown)
- Dial: Black, with silvered analog sub-dial, LCD panel and printed function legend
- Crystal: Seiko Hardlex mineral
- Case-back: Stainless steel screw-type, stamped H239-5040 and WATER RESISTANT STAINLESS STEEL JAPAN, with the Silver Wave logo
- Country of Manufacture: Japan
Condition Report
The watch is in very good vintage condition and fully functional — the analog hands run, the LCD display is clear and even with no bleeding or missing segments, and the alarm, chronograph, calendar and dual-time functions all operate as they should.
The black dial is clean, with all printing crisp and legible; the silvered analog sub-dial and its hands are unmarked. The stainless steel case retains its original brushed and polished finishing with the facets and edges still sharp, showing only light handling marks consistent with age. The case-back shows scratches and patchy surface mottling across most of its face, and the clasp shows normal wear. The Hardlex crystal is clear. The original steel bracelet is complete and holds well on the signed clasp.
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 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 H239 ana-digis put a motor-driven analog display and a liquid-crystal panel on one face, with the digital side carrying the calendar, alarm, second time zone and stopwatch.
The weak point on any watch of this type is the LCD: panels fade and segments drop out with age, so working condition matters more than on a mechanical watch of the same period. This one runs on both displays, reads cleanly across every function and is still on its original Seiko bracelet with the signed clasp.
Modes of payment:
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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 Hattoriin Tokyo, Seiko introduced the world’s first commercialquartz wristwatchin 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.
