DOXA SUB 300T “Aqualung” Searambler


DOXA SUB 300T “Aqualung” Searambler dial

Here, we have the SUB 300s son or daughter, but let us say “next generation” in these politically correct times; a very special DOXA 300T “Aqualung” Searambler.

We have talked about this watch’s backstory within our write-up of a “Sub 300 “Black Lung” we were lucky enough to have sold. Have a look here! …

Doxa SUB 300 “Black Lung” Prototype – The Chrono Duo – Vintage watch sales

Remember, the SUB 300 was an innovative watch, specifically designed for both Professional and Recreational divers, and as DOXA sold their watches through dive shops, rather than jewellers, they had proper feedback from their clients.

Let’s not forget Jacques Cousteau was also heavily involved in retailing these watches throughout the USA, through his company US Divers Co., so he and his team would have also suggested upgrades they felt necessary.

The lessons learned, were quickly implemented, and within a year of the SUB 300s introduction, a series of improvements were made to enhance legibility and the ease of use of the watch whilst diving; ultimately increasing the wearer’s safety.

So, in 1967, the SUB 300T was born…

And what were those improvements?

Well, the case was made larger, to house the increased size dial, from 27mm to 28mm. The domed Perspex crystal was replaced with a flat mineral glass, lessoning distortion of the dial underwater. The bezel was increased in thickness to make it even easier to handle with diving gloves.

And finally, the blatant issue with the second’s hand was resolved by adding a luminous insert into its iconic square lollipop hand ensuring its visibility, whatever it happened to be passing over that was printed on the dial!

This SUB 300T Searambler (Silver dial) is even more special; in that, it was sold through Jacques’ U.S. Divers operation, as it carries the outline “aqualung” logo in its third quartile of the dial. It is thought that less than 300 of these exist, but who knows!

Overall, this SUB 300T is in great condition.

The case has a few dings here and there, but it should have them, after all, this watch was built to be used in the harshest of environments. The hands, silver “Sunburst” dial and bezel are all original too and show that lovely patina, only age can create. The crown has been replaced during its lifetime, which is a shame, but not a disaster.

The case back is an early example having the Sailboat medallion in its centre, but interestingly doesn’t have either a serial number or reference number engraved in their normal positions.

Intriguingly, it is engraved with “TOG-7” & “YC-01”, which suggests this watch was “issued” somewhere; to a company or dive team or individual? We just don’t know but would love to find out, so any information would be gratefully received.

The watch had a full service in October 2021, so is working as you would expect.

The 300T is a classic, tough, and reliable piece that is unmistakable as a tool watch. It looks as good today as it did in 1967 and it’s rare too!

It’s amazing to think so many standard features on modern dive watches being invented and implemented on a single reference.

The DOXA Sub 300T was truly ahead of its time and has become an iconic dive watch. Today, it’s not just Divers who know who DOXA are!

We work hard to ensure you are pleased with your purchase, both before and after the sale. Contact us to request any additional information.


We aim to dispatch items within 1-2 days receipt of payment.

The delivery method can vary depending on the value of the watch. All watches are sent fully insured usually using UPS.

All watches sold without an original box will still be dispatched with a ChronoDuo presentation box.


All timepieces purchased from us come with a guarantee of authenticity and our 12-month time-keeping warranty. Please note that accidental damage or damage to the item resulting from third-party repairs, improper handling, or liquid damage will void our warranty. We do not guarantee any of our watches to be waterproof.