
Wristwatches · Wristwatch
Zodiac Sea-Chron (Ref. 872-840), 1970s
- Maker / attribution
- Zodiac (maker)
- Date
- 1970s
- Historical period
- Quartz Revolution (1969 – 1990)
- Country of origin
- Switzerland
- Object type
- Wristwatch
- Stock no.
- ZSCH872840-2
- Credit line
- Dealer listing, Craft & Tailored (ZSCH872840-2)
- Catalogue title (original)
- 1970s Zodiac Sea-Chron (Ref. 872-840) (English)
View the source record (dealer listing) ↗ (opens another website in a new tab)Suggest a correction
Record summary
Catalogued by Craft & Tailored (dealer), Los Angeles (stock number ZSCH872840-2), this is a wristwatch by Zodiac, made in Switzerland, dated 1970s. The Atlas places it in the Quartz Revolution period (1969 – 1990) of its Wristwatches collection. The record is illustrated with 6 photographs.
Assembled from the source record's structured fields. Dates and attributions are given as the source states them; where a field is missing the Atlas leaves it blank rather than estimating.
Catalogue description
Dealer description — Craft & Tailored
Zodiac made several sports models in the 50s-60s and were direct competitors to Rolex, Blancpain, and Tudor but are oddly often looked over. They don't receive the same clout as the aforementioned companies and as such Zodiac is one of the more undervalued Swiss timepiece companies to come from this "golden era" of sports watches. The Zodiac Sea-Chron was a charming step to modernizing the brand to offer more sophisticated designs than their competitors were producing. This diving chronograph is powered by the Valjoux cal. 726 and shares some aesthetic design cues with some of its counterparts of the 70s, namely Heuer, Zenith, and Movado. However, the Zodiac Sea-Chron remains unique, distinctive and bold. SPECS Stock # ZSCH872840-2 Brand Zodiac Style Sea-Chron Model 872-840 Serial 22XXXXX Size Men's Material Stainless Steel Dial Matte Black Millimeters 39 Bracelet NATO Strap CASE & BRACELET The Sea-Chron features a 39-millimeter stainless steel case with large pump pushers and a fantastic oversize crown. The lugs are short and tapered, with wide, sharp bevels that have never even heard of a polishing wheel. The bezel is beautifully designed, a mix of black and silver. And while it shows some small battle scars, it managed to protect its inlaid tritium marker in the top triangle. Something usually long lost on these watches. The Zodiac is worn on a color complimenting, black and tan NATO strap. DIAL & HANDS The matte black dial is busy and wonderfully preserved. It features two large counters at 3 and 9, while opting for the balance of a smaller 12 hour chronograph register at 6. The tritium hour markers and thick index style hands have all acquired the beautiful golden patina we've come to love from these vintage watches. ACCESSORIES None. The watch is in perfect working condition, previous service history is unknown.
Historical context
Quartz Revolution (1969 – 1990)
Seiko's Astron begins mass quartz timekeeping; traditional industries contract sharply.
Quartz and digital watches transformed the market after 1969. Swiss employment collapsed, Japanese and Hong Kong production soared, and the Swatch (1983) helped the Swiss industry recover; mechanical watches survived as luxury goods.
Read the period in the timelineMore wristwatches from this periodEarlier: Modern Mechanical Horology
Atlas type guide
Wristwatches
Bracelet watches were worn by women from the early nineteenth century — Breguet made one for Caroline Murat, Queen of Naples, in 1810–12 — but the wristwatch only became a man's instrument with military use and aviation in the early twentieth century. Between the World Wars it overtook the pocket watch; the 1920s and 1930s brought rectangular Art Deco cases, water-resistant cases and the first automatic winding systems.
After 1945 the wristwatch became a carrier of identity — dress watches, sports and dive watches, chronographs, calendars — produced by Swiss, American, Japanese, German, Soviet and Chinese industries. The quartz revolution after 1969 and the mechanical renaissance since the 1990s, including the rise of independent watchmakers, complete the story.
What to look for
- The reference number (between the lugs or inside the case back) and serial number, the starting point for dating.
- The calibre: its maker and number are often stamped under the dial or on the bridge.
- Originality of dial, hands and crown — refinished ('redial') dials are common.
- Case material marks: 18K/750, 14K/585, stainless steel, gold-filled, plated.
Dating clues
- Wire-lug cases: before c. 1925.
- Water-resistant screw-down cases: from 1926.
- Quartz movements: from 1969; sapphire crystals widespread after c. 1980.
General guidance written by the Atlas editors about this kind of object. It is not a statement about this particular piece; for that, rely on the source record above and on physical examination.
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