Skin diving refers to short dives using only basic equipment like snorkel gear. Watches for this kind of activity naturally need to be reasonably water-resistant, but not to the extent of the more well-known, chunky dive watches that are rated to withstand hundreds of meters of water pressure (though some skin diver watches are rated to “professional diving” depths). This allows them to often be thinner and generally more wearable in out-of-water situations as well.
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https://gearpatrol.com/2019/07/12/affordable-vintage-skin-diver-watches-american-brands/