There is little difference between a water-resistant and waterproof watch.
There are virtually no differences between a water-resistant watch and a waterproof watch. No watch is 100 percent waterproof. A watch wearer performing routine daily tasks will find little significance in the distinction.
Origins
"Waterproof" watches began to appear in the mid-1920s with the development of the Rolex Oyster watch, which was manufactured with seals to keep water out of the case, according to Watches.co.uk.
ISO Changes
Watches made up to about 1970 were identified as "waterproof," but the introduction of ISO (International Organization for Standardization) 2281 changed the identification to "water resistant" as a more accurate term.
Not 100 Percent
A water-resistant watch repels water but is not waterproof. No timepiece is completely impervious to water.
Virtually the Same
The term water resistant is viewed by watchmakers and sellers as being waterproof only up to a certain amount of water exposure.
Ratings
A watch rated at 30 meters, for example, simply means the watch has seals that allow the watch to be worn while washing a car, taking a short shower or withstanding skin perspiration. Complete submersion in water will likely ruin it .
Seals
Some watches, such as scuba watches, have stronger seals to better withstand water depths of up to 35 feet, but resistance lessens as the seals get older.
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