1969 Zenith Sub Sea Diver (Ref. A3630)


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


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.


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.


None. The watch just received a complete service and is running at COSC spec backed by a 1-year warranty on accurate timekeeping.