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1970s Zodiac Spacetronic Electronic 36mm Men’s Watch Cal. 91 Runs — view 1 of 4
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Wristwatches · Wristwatch

1970s Zodiac Spacetronic Electronic 36mm Men’s Watch Cal. 91 Runs

DocumentedDocumented from an auction catalogue; attribution as stated by the auction house.
Maker / attribution
Zodiac (maker)
Date
1970s
Country of origin
Switzerland
Object type
Wristwatch
Lot
Item 219006030
Credit line
Auction lot record: lot 430, EXCLUSIVE WATCHES AND POCKET WATCHES 3, Sphere Auctions LLC (2025), via LiveAuctioneers
Catalogue title (original)
1970s Zodiac Spacetronic Electronic 36mm Men’s Watch Cal. 91 Runs (English)

View the source record (auction lot) ↗ (opens another website in a new tab)Suggest a correction

Record summary

Catalogued by LiveAuctioneers auction archive (lot Item 219006030), 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 4 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

Lot description — Sphere Auctions LLC

Circa 1970s Zodiac Spacetronic Electronic wristwatch featuring a distinctive hexagonal stainless steel case and silver sunburst dial with applied indices, baton hands, and date window at 3 o’clock. Powered by the Zodiac Caliber 91 electronic movement (based on the ESA Dynotron hybrid), this model represents Zodiac’s early transition from mechanical to battery-powered technology.Movement marked Zodiac Ltd 91 and in clean condition. Caseback signed Zodiac Swiss Electronic, Shock Resistant, Water Resistant, Antimagnetic. Measures 36mm in diameter excluding crown. Fitted with a vintage stainless steel mesh bracelet. Runs and keeps time, but service is recommended for accuracy and longevity. A fine example of Zodiac’s 1970s electronic innovation.---DetailsBrand: ZodiacModel: Spacetronic ElectronicEra: 1970sCase Size: 36 mmMaterial: Stainless steelMovement: Zodiac Cal. 91 (ESA 9154 Dynotron base)Dial: Silver sunburst with baton indices and date windowCrown: SignedCrystal: AcrylicBracelet: Vintage stainless mesh bandCondition: Runs; service recommended; light dial patina and case wear

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

Quartz, digital and electronic watches

Electronic watches arrived in three steps. The Hamilton Electric 500 (1957) was the first battery-powered wristwatch, still with a balance; Bulova's Accutron (1960) used a tuning fork. On 25 December 1969 Seiko released the Astron 35SQ, the first quartz wristwatch, closely followed by the Swiss Beta 21 group. In 1972 Hamilton's Pulsar introduced the LED digital watch, and LCD displays soon made digital watches cheap.

The 'Quartz Crisis' that followed devastated the Swiss mechanical industry, which lost two-thirds of its workforce between 1970 and 1984 before recovering with the Swatch (1983) and the luxury mechanical revival. Solar, radio-controlled, kinetic and connected smartwatches continue the electronic line.

What to look for

  • Battery hatch in the case back and calibre markings with 'Quartz' or a crystal frequency.
  • Display technology: LED (red, push-button) versus LCD (always-on).
  • Tuning-fork hum and a smoothly sweeping seconds hand on Accutrons.
  • Model and reference numbers, often printed on the back.

Dating clues

  • Electric balance watches: from 1957.
  • Tuning-fork watches: 1960–c. 1977.
  • Quartz analogue: from December 1969; LED digital: 1972–c. 1978; LCD from 1973.

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.

Read next:Seiko calibre 35A (Astron)

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