No expert at all, but I'm thinking all the rolled crimp shells, with the possible exception of the .410's, are over 50 years old. I started quail hunting with my Dad, actually carrying a gun, in 1961, and I'm reasonably sure all the shells we bought then, except for the .410, had already switched over to star crimps. I think the .410's were still roll crimped probably into the early 70's.