Just picked up a 1969 sweet sixteen. Serial number 69s xxxxx. Will post pictures soon. It sat in a safe for 40 years, so it’s getting new springs and a good cleaning. Was looking at barrel markings and looks like it has the letter i on the barrel which I believe is 1970. Person that I got it from said it was original, his dad had bought it new in 1974. Is it possible that it was made in the latter part of 69 and a70’s barrel was put on it or not original barrel. No serial number on the barrel.