Question to a watchmaker, water resistance of my vintage GMT

[Montrealer]

Maybe someone could chime in and help me shed some light on some the water resistance test that was performed on my vintage 1967 GMT Master.

As part of the service, the following data was provided from tests performed with an Elma-Spheric tester.

Test pressure: -0.4 bar
Maximum deformation: -22.85 um
Tightness value: -0.2%/min
Test 1: OK

Test pressure: +3.0 bar
Maximum deformation: +201.85 um
Tightness value: +1.9%/min
Test 1: OK

In layman's terms, what does this tell me about my watch ?

Thanks in advance experts !

[rmfnla]

In layman's terms, and based on both "Test 1" results, you are... OK

[Montrealer]

Originally Posted by rmfnla

In layman's terms, and based on both "Test 1" results, you are... OK

Lol!

Ok but for what? sweat, rain, shower, swim or dive ?

[rmfnla]

I assume for the full original depth rating, but let's wait on a real expert to weigh in instead of trusting my assumption...

[Blackdog]

Originally Posted by Montrealer

Maybe someone could chime in and help me shed some light on some the water resistance test that was performed on my vintage 1967 GMT Master.

As part of the service, the following data was provided from tests performed with an Elma-Spheric tester.

Test pressure: -0.4 bar
Maximum deformation: -22.85 um
Tightness value: -0.2%/min
Test 1: OK

Test pressure: +3.0 bar
Maximum deformation: +201.85 um
Tightness value: +1.9%/min
Test 1: OK

In layman's terms, what does this tell me about my watch ?

Thanks in advance experts !

That looks like a very basic WR test.

It's a dry test done under a closed bell with partial vacuum and compressed air.
The first test is underpressure, the second is overpressure. In both cases the machine measures the deformation of the case and that said deformation is stable enough (meaning that there's no air coming out or in the watch at that pressure). If the deformation change is within limits the test passes.

But the overpressure test was done at +3 atm, this is only 30 mts. As far as I know the GMT should be WR to 100mts (10 atm).

Is 30mts WR enough ? Probably OK for daily wear, but I would't swim with it.

The question is: did it NOT pass a 10 atm test or was it simply not tested ? Like I said, the test is dry and perfectly safe for the watch even if it fails.

[Alexus]

If the Watch passed 3 bar = 30 mts:
I would consider my watch passing 10bar too. (More Pressure to the Seal should "close" it even more..)
just my2cents
btw: At my desk I certainly don't dive as deep as my watches are able to ;)

[Montrealer]

Thank you gentlemen

[Passionata]

My RSC checks vintage sports models at 5atm, if passes it s fine for swiming /shower etc.

[Alexus]

Adidtional Info
My 1665 came recently back from Geneva with a note "Not Waterproof". It seems they have started to ad this to almost all watches older then maybe 30 Years.
It was "Swimpruf "when I gave it to the Service. I insisted that the AD checked for me my 1665 to 300m.
I was just fine...

[Rikki]

3 bars is barely 100 feet should be at least 5 to 7 bars in an air tester anymore it wont test because the deformation will be too great. Sapphire will easily test to 10 bars or apprx. 333 feet or so which is where I test to unless you want it water test to 125 bars or 4275 feet for the seadweller. Rikki