San Martin: A watch’s dial or case back will indicate whether it is water-resistant. If the watch is marked as water-resistant and no particular depth is specified, it satisfies general water-resistant requirements. Water resistance is not a permanent characteristic, though. Regular inspection is necessary because the gaskets surrounding the case back, crystal, and crown can deteriorate over time. This examination is frequently merely a visual check for a general water-resistant watch. Usually applied during battery replacement, silicone lubrication can help extend the life of the gaskets – SAN MARTIN WATCHES