Seiko Solar Day-Date – Black Dial with Bilingual Kanji Day Wheel

SEIKO solar 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 Seiko Solar

Seiko’s first solar analogue watch arrived in 1977 — caliber 4826, with twelve small photovoltaic cells arranged around the dial as a visible chapter ring. Citizen had beaten Seiko to a production analogue solar watch by a year with the 1976 Crystron Solar Cell, and the early cells were still too weak and too large to hide, so both makers had to design around them rather than conceal them. What followed over the next three decades was largely a materials problem: making the panel efficient enough to disappear underneath an ordinary-looking dial.

Modern Seiko Solar is the result of solving it. The panel now sits directly beneath the dial, invisible from the front, and converts daylight or ordinary indoor lighting into electricity stored in a rechargeable manganese-titanium-lithium cell rather than a disposable battery. A full charge runs the watch for roughly ten months in complete darkness, so the case back stays shut for years at a time instead of being opened every couple of years for a new cell.

The V-series calibres that carry the system are Seiko’s volume workhorses rather than showpieces, fitted across everyday international ranges and Japanese-market dress watches alike. Caliber V158 is the day-date member of the family: rated to within ±15 seconds a month, with quick-set day and date, an instant-start function that gets the hands moving as soon as the watch sees strong light, and a depletion warning that shifts the seconds hand into two-second steps when the charge runs low.

About This Watch

The case back of this example is stamped V158-0AV0, together with WATER RESISTANT 10 BAR, STAINLESS STEEL and MADE IN JAPAN. The serial number is 910223. Seiko’s dating scheme encodes the last digit of the year followed by the month, so this reads as January of a year ending in 9 — January 2019, since caliber V158 only reached the market around 2009 and this case code belongs to a later release than the earliest V158 references.

The dial is plain matte black, with applied polished baton indices, a printed minute track and a slim outer chapter ring. Below the centre it reads simply SEIKO and SOLAR: this reference carries no line name on the dial, so the watch is identified by its case reference rather than by a model name. The window at 3 o’clock shows both day and date, and the day disc is bilingual — English on one setting, Japanese kanji on the other, with Sunday printed in red. A bilingual kanji day wheel is a Japanese-market fitting; the movement behind it is the same V158 Seiko fitted internationally.

Underneath, the movement plate is marked TWO JEWELS, SEIKO TIME CORP., JAPAN and V158A, and the rechargeable cell carries Seiko’s RECHARGEABLE BATTERY ONLY warning — a reminder that this cell is charged by light and must never be swapped for an ordinary watch battery. The watch comes on its original Seiko steel bracelet with a signed SEIKO folding clasp.

Technical Specifications

• Brand: Seiko
• Line: Not named on the dial — Seiko Solar, Japanese-market model
• Reference Number: V158-0AV0 (case back); dial code V158-0BT0
• Movement: Seiko caliber V158A, solar-powered quartz, 2 jewels
• Accuracy: ±15 seconds per month at normal wearing temperature
• Power Source: Seiko MT920 rechargeable manganese-titanium-lithium cell, charged by light — never a disposable battery
• Power Reserve: Approx. 10 months from a full charge
• Serial Number: 910223
• Production Date: January 2019
• Case Material: Stainless steel
• Case Diameter: Approx. 38 mm (excluding crown)
• Water Resistance: 10 bar (100 m), as marked on the case back
• Dial: Matte black with applied polished baton indices; bilingual English/Kanji day and date at 3 o’clock
• Crystal: Flat glass; the crystal type is not marked on the watch
• Bracelet: Original Seiko stainless steel bracelet with signed SEIKO folding clasp
• Case-back: Solid stainless steel, stamped SEIKO / WATER RESISTANT 10 BAR / STAINLESS STEEL / MADE IN JAPAN
• Country of Manufacture: Japan

Condition Report

The dial is excellent — no marks, blemishes or discolouration, with the applied indices and the printed text crisp throughout. The hands are clean and unspotted, and the calendar changes correctly in both languages.

The case is in good used condition. The polished surfaces of the case sides, lugs and bezel carry light scratches and handling marks consistent with ordinary wear, and the case back shows the usual fine swirls from case tools and desk contact. Nothing is dented and the case has not been over-polished — the edges are still crisp.

The crystal is clear, with no chips and no scratches that catch the light.

The bracelet is the original Seiko one with a signed clasp, and it carries the most wear of any part of the watch: scuffing and light scratching across the polished links, heaviest on the clasp cover. It is structurally sound and closes securely. Its current length is shown in the product images.

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.

Why Collectors Want This Watch Today

This is not a rare watch and it is not offered as one. Seiko built caliber V158 in very large numbers across a long list of references, and examples come up for sale regularly.

What it offers instead is a combination that is genuinely useful and quietly hard to find at this price: a plain, correctly proportioned steel dress watch with a black dial and a day-date, that never needs winding and never needs a battery. A full charge runs for about ten months in the dark, so it can sit in a drawer through a whole season and still be going when it comes out. For anyone who wants one watch that simply works — something to wear to an office, a wedding or an airport without thinking about it — that is a sensible set of properties, and 10 bar of water resistance means it does not have to come off at the sink.

The bilingual kanji day wheel is the detail that lifts it above the merely sensible. It marks the watch out as a Japanese-market fitting rather than an export model, and it is the sort of thing an owner notices with pleasure every time the day flips over.

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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.