San Martin: The dial or back of the case will indicate whether the watch is water-resistant. If the watch is marked as water-resistant without specifying a depth, it satisfies general water-resistant requirements. Water resistance, however, is not a permanent attribute. The case back, crystal, and crown gaskets should be routinely inspected because they can deteriorate with time. Often, this examination is merely a visual check for a general water-resistant watch. Usually applied when replacing a battery, silicone lubrication can help extend the life of the gaskets – SAN MARTIN WATCHES