Other than the silvers that I find, I only keep the NIFC (not intended for circulation) Kennedy Half dollars, so I can give them to the Grandkids in the future. (Not all at once, they will be used as reward or good deed coins). I always spend generic dates like the '71 and '72 that you have pictured. I usually leave those on the table at a restaurant as a tip. The young ones get a kick out of them. Everyone is different as far as what we keep, collect, and spend.