When I was a kid I wrote a letter to Jim Kelly. He sent me a 5x7 black and white picture with a robo copy of his signature. Joe Ferguson sent me a nice 8x10 glossy with a real signature and and wrote my name and best wishes on it. I still have those somewhere. I also wrote Arnold Palmer. He sent me a nice 8x10 photo with a real signature. I wrote Sam Snead a couple times, but he never srote back. For some reason, I wrote the Dukes of Hazzard for their autographs, too. John Schneider (Bo) sent me back a nice photo with a real signature, but he addressed his best wishes to my dad (whose name was on the return address sticker). He must not have read my whole letter, lol. Tom Wopat (Luke) never wrote back.
I also used to write to the Bills every year when I was a kid. It was such a thrill to get a large white envelope in the mail with the Bills logo on the return address. I felt pretty important. The Bills would send a bunch of pictures, stats about their previous draft picks, franchise history, etc. They also sent info about Rich Stadium.