I am very curious about the rating as well. All I know is that my Dad bought the watch specifically to time the start of sailboat races and used it for that purpose for over 15 years. While this specific watch was never used for diving, it was obviously exposed to water and held up well (according to him, he never really took it off- showers, swimming, sailing, etc.) until he retired it in 1984 or 85. The watch literally sat in a drawer until a few years ago when I resurrected it and sent it off to Omega (see before and after pic below). With respect to 60m rating, I really don’t know why it wouldn’t be rated higher. It’s a solid case with screw down crown and even has a some kind of inner case that houses the movement. Would love to know more about the watch rating and reason for the 60m if anyone knows. Omega pressure tested during the restore process and warranties for 2 years, so I am comfortable using the watch around water, but probably won’t dive with it!