Roger Daltrey
I have a 1977 that I need a rear 24 inch wheel for. I have seen 1975s also.
Sears replaced using the J.C. Higgins brand with the Ted Williams brand in 1962. The brand was used through the 60's and into the early 70's.
There were no circulation 1975 US cents struck at San Francisco, only proof coins. If you received a 1975-S cent in change, the fact that it's been spent destroyed its value as a proof coin. The good news though is that you haven't lost much. Even in its original packaging it was only worth a couple of dollars.