IN-DEPTH: The Doxa SUB 1200T

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IN-DEPTH: The Doxa SUB 1200T

Post by koimaster » October 28th 2019, 8:33am

Let’s press rewind for a second: the year is 1969, and Doxa S.A., a storied watchmaker established 80 years previously, in 1889, unveils the first publicly available dive watch in the world with a helium escape valve – the Doxa SUB 300T Conquistador.

Developed in conjunction with the doyen of deep sea diving, Jacques-Yves Cousteau, the SUB 300T Conquistador became an instant must-have among the diving fraternity. And Cousteau believed in the product so resolutely that his company, U.S. Divers, became an official distributor for Doxa watches.

https://timeandtidewatches.com/in-depth ... sub-1200t/
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Re: IN-DEPTH: The Doxa SUB 1200T

Post by MKTheVintageBloke » October 28th 2019, 2:34pm

Where the fuck from did they get the part about the 1969 SUB 300T being the first watch with a helium escape valve available to the general public? Doxa marketing materials, no doubt...

Rolex was there first, with the ref.1665 Sea-Dweller. First the helium escape valve was used on a few specimens of the experimental model (also a 1665, a prototype series) aka the "Single Red" Sea-Dweller, then it made it to the regular production ref.1665 "Double Red" in 1967.
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Re: IN-DEPTH: The Doxa SUB 1200T

Post by MKTheVintageBloke » October 28th 2019, 4:11pm

So, yes, looks like they got that from the wild claims of Doxa's marketing department. The regular production Sea-Dweller was, however, available from 1967 to the public - in regular retail. So, as usually is the case, Doxa can go fuck themselves.
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Re: IN-DEPTH: The Doxa SUB 1200T

Post by bbattle » October 28th 2019, 4:21pm

While I'm sure all of the WL members know the useful circumstances of a helium relief valve, I'm adding a post that was in the comments sections of the Hodinkee article:

Gary Owain • 5 years ago
As a former commercial saturation diver in the North Sea, I'd like to give you an important point- helium release valves have nothing to due with how deep a watch can go. While working in the North Sea, we would live in saturation chambers for 30 days.These chambers were dry environments and were located on the oil rig or ship. They were at an internal pressure of the diving depths ( ie 200m-665ft). At this depth, we were breathing 95% HELIUM. Now helium is one of the smallest molecules and it penetrate ANY watch seal. After being in the chamber for 30 days a lot of helium has built up INSIDE the watch case. As we were slowly brought back to the surface over 5 days, the pressure was decreasing in the chamber. Boyle's Law states that as pressure decreases, VOLUME increases( including inside the watch).Think of champagne. As long as the bubbles are under pressure with the cork in the bottle all is well. Remove the cork(lessen the pressure and out explodes the champagne!) We would reach a point where the helium in the watch expanded to such an extent that BANG! it blew the crystal off. I witnessed this MANY times on various watches no matter what their depth rating. HRV allow the internal helium to escape as the pressure decreases during assent. You could also have a dive watch with such a strong case/crystal that it could withstand the expanding pressure of the helium and be able to handle it. My Zodiac Super Sea Wolf was brilliant at those depths while I saw Rolex Submariners popping crystals regularly.Hence the development of the HRV. I believe it was a co-patent between Doxa & Rolex. I hope this helps. Gary


Any schmoe that thinks he needs a Helium relief valve because he once swam to the bottom of the deep end of the pool deserves the lightening of his wallet. He's also likely to be an Invicta fan. :-)
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Re: IN-DEPTH: The Doxa SUB 1200T

Post by bedlam » October 28th 2019, 4:52pm

bbattle wrote:
October 28th 2019, 4:21pm
While I'm sure all of the WL members know the useful circumstances of a helium relief valve, I'm adding a post that was in the comments sections of the Hodinkee article:

Gary Owain • 5 years ago....
As a former commercial saturation diver in the North Sea, I'd like to give you an important point- helium release valves have nothing to due with how deep a watch can go. While working in the North Sea, we would live in saturation chambers for 30 days.These chambers were dry environments and were located on the oil rig or ship. They were at an internal pressure of the diving depths ( ie 200m-665ft). At this depth, we were breathing 95% HELIUM. Now helium is one of the smallest molecules and it penetrate ANY watch seal. After being in the chamber for 30 days a lot of helium has built up INSIDE the watch case. As we were slowly brought back to the surface over 5 days, the pressure was decreasing in the chamber. Boyle's Law states that as pressure decreases, VOLUME increases( including inside the watch)....


Any schmoe that thinks he needs a Helium relief valve because he once swam to the bottom of the deep end of the pool deserves the lightening of his wallet. He's also likely to be an Invicta fan. :-)
The above diver's comment is incorrect. The MM300, Marinemaster Tunas and OS300 are saturation capable dive watches using specialised seals that helium can't breach. There is no need for the HRV if you make the watch properly in the first place.
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Re: IN-DEPTH: The Doxa SUB 1200T

Post by conjurer » October 28th 2019, 10:08pm

bedlam wrote:
October 28th 2019, 4:52pm
bbattle wrote:
October 28th 2019, 4:21pm
While I'm sure all of the WL members know the useful circumstances of a helium relief valve, I'm adding a post that was in the comments sections of the Hodinkee article:

Gary Owain • 5 years ago....
As a former commercial saturation diver in the North Sea, I'd like to give you an important point- helium release valves have nothing to due with how deep a watch can go. While working in the North Sea, we would live in saturation chambers for 30 days.These chambers were dry environments and were located on the oil rig or ship. They were at an internal pressure of the diving depths ( ie 200m-665ft). At this depth, we were breathing 95% HELIUM. Now helium is one of the smallest molecules and it penetrate ANY watch seal. After being in the chamber for 30 days a lot of helium has built up INSIDE the watch case. As we were slowly brought back to the surface over 5 days, the pressure was decreasing in the chamber. Boyle's Law states that as pressure decreases, VOLUME increases( including inside the watch)....


Any schmoe that thinks he needs a Helium relief valve because he once swam to the bottom of the deep end of the pool deserves the lightening of his wallet. He's also likely to be an Invicta fan. :-)
The above diver's comment is incorrect. The MM300, Marinemaster Tunas and OS300 are saturation capable dive watches using specialised seals that helium can't breach. There is no need for the HRV if you make the watch properly in the first place.
Well said, you commie bastard! :Thumbsup:
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