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Croton Aviator Sea Diver Chronograph (Ref. 9870), 1970s — view 1 of 6
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Wristwatches · Wristwatch

Croton Aviator Sea Diver Chronograph (Ref. 9870), 1970s

DocumentedDocumented from a dealer's listing; attribution and date as stated by the dealer.
Maker / attribution
Croton (maker)
Date
1970s
Country of origin
Unrecorded in source
Object type
Wristwatch
Dimensions
Case 38 mm
Stock no.
CPCAUTDV-2
Credit line
Dealer listing, Craft & Tailored (CPCAUTDV-2)
Catalogue title (original)
1970s Croton Aviator Sea Diver Chronograph (Ref. 9870) (English)

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Record summary

Catalogued by Craft & Tailored (dealer), Los Angeles (stock number CPCAUTDV-2), this is a wristwatch by Croton, dated 1970s. The Atlas places it in the Quartz Revolution period (1969 – 1990) of its Wristwatches collection. Recorded dimensions: Case 38 mm. 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

The Chronomaster range of watches from Nivada Grenchen and Croton were produced in a time when adventures and exploration were at the forefront of what was happening in the world and within the pop culture of the 1960s. Within the expansive world of vintage timepieces, there is no uncertainty that vintage tool watches hold a particular position within the minds of numerous collectors. The 1960s and 1970s were what we now know as the golden era of sports watch design where the form of a watch needed to meet its intended function to support the adventures that the watch was created for. Nivada Grenchen or Croton in the States was founded in Grenchen, Switzerland in the 1920s by Jacob Schneider, Nivada Grenchen was actually one of the first watch brands to manufacture automatic watches. Nevada encompassed another modern wristwatch innovations as well, creating waterproof and “rustless” watches that would stand up to the rigors of the outdoor adventures they were creating a watch for. This ref. 9870 utilizes a Valjoux 7733 chronograph movement and features broad baton-style hands more often seen on later variants of the Croton Aviator Sea Diver. The Croton ref. 9870 features a large stainless steel 38mm stainless steel case with long and angled lugs. The case is outfitted with an aluminum minute/hour bi-directional bezel that is not only unique but useful. The simple and no-nonsense dial is beautifully executed with a flash of red in the rightmost sub-dial that offers a 5-minute count down interval. The Aviator Sea Diver ref. 9870 covers all of these classic sport watch ques from this golden era of classic sports watch design. SPECS Stock # CPCAUTDV-2 Brand Croton Style Aviator Sea Diver Model 9870 Serial N/A Size Men's Material SS Dial Matte Black Millimeters 38mm Bracelet 2pc Handmade Leather Strap CASE & BRACELET DIAL & HANDS The matte black dial is in superb original condition. The tritium lume plots have aged to a wonderful dark brown patina and show no degradation under U.V. light inspection. The original tritium hands have aged lighter than the dial, under U.V. light inspection the minute hand shows a light crack in the lume which appears to have been repaired, the hour hand remains fully intact. ACCESSORIES

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

Chronographs and split-seconds watches

A chronograph is a watch with an additional seconds hand that can be started, stopped and returned to zero independently of the timekeeping. Louis Moinet built an early example in 1816 and Nicolas Rieussec a recording 'chronographe' in 1821; Adolphe Nicole's heart-shaped reset cam (patented 1862) made the modern return-to-zero possible. Split-seconds (rattrapante) chronographs add a second hand that can be stopped for intermediate times; flyback chronographs restart instantly.

Chronographs were essential tools for doctors (pulsometer scales), artillery (telemeter), engineers and sport. In wristwatches, Valjoux, Venus, Lemania and later the automatic chronographs of 1969 (Zenith El Primero, the Chronomatic Calibre 11 group and Seiko 6139) are milestones.

What to look for

  • Push-pieces on the case band or a single button in the crown (monopusher).
  • Subsidiary registers for minutes and hours; tachymeter, telemeter or pulsometer scales.
  • Column wheel versus cam control visible in the movement.
  • Calibre markings of specialist makers (Valjoux, Lemania, Venus, Landeron).

Dating clues

  • Pocket chronographs with heart cam reset: after 1862.
  • Wrist chronographs: from c. 1910; two-button designs from the 1930s.
  • Automatic chronographs: from 1969.

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:Flyback chronographChronograph

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