Validité des anciens dollars US?

NO PROBLEM.........I was just donating a suit to charity.......a suit I had not had on since 1981...something told me to check the pockets, I almost didn't....it had 306 dollars in the pocket S C O R E~~!!the 3 100 dollar bills were from 1977, no one questioned then when I spent them which did surprise me because now everyone looks for the security stripe, the watermark color changing ink.......none of which is present on a 1977 issue.