That's an amazing piece of history that shows the love the original owner had for it. The "my favorite" written above Doc Ock's head says it all, never mind the staples and tape that were added to keep it together. If all this wear comes from your dad from when he was a kid, that's probably a great piece of nostalgia with sentimental value potentially outweighing market value. I'm with those who say to keep it raw - if it's a piece of memorabilia from your dad's childhood, it may well be worth keeping for that meaning alone.