Zenith Diver A3637 Big Sea Blue

The Zenith Diver reference A3637 is a rare dive watch from the late 1960s that immediately stands out with its bold and vibrant color scheme.

Its nickname, "Big Sea Blue," is easy to understand thanks to the oversized 43 mm case and the striking blue tones of both the dial and bezel. The dial is in beautiful original condition and free of scratches. The large hour markers retain their original tritium lume with distinctive orange surrounds. The characteristic handset consists of a bold orange minute hand, a paddle-style seconds hand, and a matching orange hour hand. The date aperture is positioned between 4 and 5 o'clock.

The bright blue Bakelite bezel, featuring orange minute markers and numerals as well as a yellow triangle at 12 o'clock, further enhances the watch's unmistakable character. It rotates bidirectionally and is preserved in excellent condition.

Powering the watch is the reliable Zenith automatic caliber 2552 PC, which continues to deliver very good timekeeping performance and makes this watch a dependable companion for everyday wear.

The watch is fitted with a high-quality vintage-style stretch bracelet. It comfortably conforms to the wrist, offers excellent wearing comfort, and perfectly complements the watch's authentic retro character.

Overall, this Zenith A3637 is a rare, reliable, and eye-catching vintage dive watch whose bold design and comfortable wear make it an ideal companion for the summer months.

Condition Report
Dial: Excellent blue lacquered dial – free of scratches – original, attractively aged tritium lume in both the hour markers and hands – date aperture between 4 and 5 o'clock – signed "Zenith Automatic T Swiss Made T".

Case: Oval stainless steel case in great condition – approx. 43 mm – light signs of wear – well-preserved lines and edges – screw-down case back with the characteristic "NATO Star" logo – no visible serial number on the case back – bidirectional Bakelite bezel in excellent condition.

Movement: Zenith automatic caliber 2552 PC – timegrapher results: rate deviation +9 seconds/day, amplitude 257°, beat error 0.5 ms.

Int.Exe.: 85750