I went back to a spot that is a snapshot of the mid 1970,s most tabs are the ring pulls and some of the late 70,s ones but one was steel and atached to a can with an aluminum top but all steel bottom this suprized me as i have never seen a steel pull tab, found some nic copper wire and a 1965 quarter that looks like it seen 10 years of circulation , no gold no silver but it was an intresting dig ,