Quote:
Originally Posted by H.W. Frank
I am not a watch mechanic, however, the pictogram card from my 3570.50 says
"5 Bars." A bar is the practical equivalent of an atmosphere of pressure, or ATM. Ambient pressure at the surface is 1 ATM, and every 33 feet of saltwater increases the ambient pressure by one ATM. So, five ATM is 132 feet of saltwater. It's beyond me why an AD would make a recommendation to pamper your Speedmaster like your Blackberry. I don't dive with mine, but I never worry about showers, rain, car-washing, etc.. Also can't imagine that NASA would've selected a watch as water-resistant as a toaster for astronaut issue; after all, until the shuttle, astronauts landed in water. I make sure the crown is pushed in, and then don't even think about it.
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I don't think you are correct?
On the surface there is no pressure on the watch case.
inside = outside.
Take it down 33 feet and you have 1 Bar (approx 14.8 PSI) on the case.
5 Bar = 165 feet.