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Hamilton Chrono-Diver "Big Eye" Chronograph, 1970 — view 1 of 6
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Hamilton Chrono-Diver "Big Eye" Chronograph, 1970

DocumentedDocumented from a dealer's listing; attribution and date as stated by the dealer.
Maker / attribution
Hamilton (maker)
Date
1970
Country of origin
Switzerland
Object type
Wristwatch
Dimensions
Case 38 mm
Stock no.
HM70BEC
Credit line
Dealer listing, Craft & Tailored (HM70BEC)
Catalogue title (original)
1970 Hamilton Chrono-Diver "Big Eye" Chronograph (English)

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Record summary

Catalogued by Craft & Tailored (dealer), Los Angeles (stock number HM70BEC), this is a wristwatch by Hamilton, made in Switzerland, dated 1970. 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

Hamilton Chrono-Diver Chronograph "Big Eye" The Hamilton Chrono-Diver, is commonly referred to as the “Big Eye” due to its dual and somewhat large sub dial registers. Hamilton introduced the reference in 1970, and it is a cushion style cased chronograph model with a rotating diver’s bezel which is a differentiating feature not commonly found on chronograph models and references of the same era. The watch is 38mm in diameter and has some very cool but subtle elements which place this into the middle of 70's era design. The matte grey dial is accompanied by two white subdials which each have black chrono hands. The minute track around the outside of the dial is a deep and dark red color paired with a set of white luminous filled hands and a red chronograph hand. The block trapezoidal markers are also fitting and a nice 70's era element that makes this specific Hamilton chronograph different. The Hamilton Chrono-Diver comes equipped with a bullet proof swiss made Valjoux 7733 movement which Hamilton dubbed the 647. This would make a great daily driver and is not only a vintage piece with defining and different details but also retains a classic look that would pair well with a suit in a formal setting but offers versatility and would also find itself placed well within a casual setting. Stock # HM70BEC Brand Hamilton Style Chrono-Diver "Big Eye" Model 647 Case Size 38mm Material Stainless Dial Matte Grey Lug Width 20mm Bracelet C&T Horween Leather Strap CASE & BRACELET The case of this Hamilton Chrono-Diver is in unpolished condition and retains the factory matte brushed finish. We will supply a C&T Horween horsehide leather watch strap of your choice. DIAL The grey dial dial of this 1970 Hamilton Big Eye Ref is stunning. The white block hands and the red minute track accompanied with the "Reverse Panda" sub dials really set this dial off in a classic and stunning way. ACCESSORIES None. Watch was recently serviced and is running at COSC spec.

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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