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Message: <blockquote data-quote="Cat City Slim" data-source="post: 4244624" data-attributes="member: 42075"><p>This is an interesting one you don’t see every day. It’s a Hyperbar System dive watch. The case is filled with non-conductive oil. The liquid filling renders the watch absolutely waterproof. The face states the watch was pressure tested to 12500 meters, which I believe is the deepest known point in the ocean. The air bubble you see in the picture is to provide space for the oil to expand with temperature. Cross your fingers for me, I need to change the battery in it.</p></blockquote><p></p>