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Zenith Sub Sea Diver (Ref. A3630), 1969 — view 1 of 6
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Wristwatches · Wristwatch

Zenith Sub Sea Diver (Ref. A3630), 1969

DocumentedDocumented from a dealer's listing; attribution and date as stated by the dealer.
Maker / attribution
Unrecorded in source
Date
1969
Country of origin
Unrecorded in source
Object type
Wristwatch
Dimensions
Case 38 mm
Stock no.
ZNTSSA3630
Credit line
Dealer listing, Craft & Tailored (ZNTSSA3630)
Catalogue title (original)
1969 Zenith Sub Sea Diver (Ref. A3630) (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 ZNTSSA3630), this is a wristwatch, dated 1969. 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

Zenith does an excellent job of changing one's perspective on what traditional can mean, and a perfect example of that is the ref. A3630. Yes, the ref. A3630 is a diving watch in the traditional sense, but the characteristics of this Zenith are so untraditional from what is normally seen from dive watches from the late 1960s. Every aspect of this watch has been thought out; the conservative 38mm case makes this watch feel just as suitable to wear with a dress suit as it does a wet suit, the matte black dial with high contrasting white outer minute track and arrow minute hand makes easy detection of elapsed time, and the ladder-link style bracelet is just plain funky but definitely makes for a stylish look. The ref. A3630 is powered by Zeniths inhouse 2552PC movement with date. Like most Zenith movements the 2552PC is both robust and reliable. Zenith did a good job of breaking up the monotony in the dive watch world in the 60s and 70s, but due to their different designs they often received poor sales results and so they didn't make very many pieces. Which of course is why Zenith dive watches are so coveted by collectors, like the Zenith ref. A3630, this reference has a truly unique design but is rarely seen on the open market, especially in good condition. The A3630 is perfect for any attire or situation and would make for a perfect and durable daily driver. Stock # ZNTSSA3630 Brand Zenith Style Sub Sea Diver Model A3630 Serial N/A Size Men's Material SS Dial Black Millimeters 38mm Bracelet Zenith Ladder-Link Bracelet W/ ZE End Pieces CASE & BRACELET The strong case remains in excellent condition, retaining full lugs with factory chamfers, and showing very little signs of use. The original bezel has achieved a beautiful anthracite fade, showing little wear and retains its original tritium pearl. The watch retains its original "Zenith" signed crown. The case back featuring the Zenith star logo is in clean and crisp condition. The original Zenith Gay-Freres ladder-link bracelet with original ZE end pieces is in wonderful condition, retaining 11 links and showing light stretch from use. DIAL & HANDS The gorgeous matte black dial with white outer minute track is in excellent vintage condition. The original tritium lume plots have taken on a charming darker patina, under U.V. light inspection the lume plots show no degradation. The matching hands are original to the watch and in excellent condition, the hour hand retains its original lume but received a small repair at some point, the minute and sweep-seconds hands remain fully intact with their original lume. 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

Dive and water-resistant watches

Keeping water and dust out of a wristwatch was a long-standing challenge. Rolex's screw-down Oyster case (1926) and Omega's Marine (1932) were landmarks; in the early 1950s Blancpain's Fifty Fathoms and Rolex's Submariner defined the professional dive watch with rotating bezels for timing dives, luminous dials and high water resistance. The ISO 6425 standard (1982) later codified what a 'diver's watch' must do.

Dive watches became icons of post-war design and exploration, and their evolution — helium escape valves, ceramic bezels, saturation-diving depth ratings — records the history of underwater work.

What to look for

  • Unidirectional or bidirectional rotating bezel with minute markings.
  • Screw-down crown and case back; depth rating printed on the dial.
  • Luminous hands and markers (radium before c. 1960, tritium c. 1960–1998, then Super-LumiNova).
  • Reference numbers on the case between the lugs or inside the back.

Dating clues

  • Screw-down Oyster cases: from 1926.
  • Professional dive watches: from 1953.
  • Tritium 'T' marks on dials: c. 1960–1998.

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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