My submariner is a Mark 2, originally purchased in 1969 on the island of Malta. I got it in 1989 from the guy that bought it new. He wore it every day as I have done and still do. Both of us were commercial divers although we never wore it diving. I have a great Jeweler in Houston (George @ Swiss Watch Co) that takes care of it every five years or so. He told me the case was cast in 1967. Still has the original 9315 bracelet. Phenomenal that a watch works for 52 years and still going strong. Oh yeah, it still looks Fantastic!