I recently purchased a book for my football book collection called "Inside Defensive Football" by Dick Butkus. When I opened it, to my surprise there was an autograph on the first page. I was wondering if anyone knows anything about Dick's old signature because most items I see now he attaches his first and last name together, which in the book he did not. However, I believe it is an old signature because it is personalized to "Richard Woulfe" who had a few papers inside with drawings of plays on them. He put his name and date on the top, with the date being September 18, 1973. The date has lead me to believe it is an old signature, and I was wondering if anyone knows if he changed his signature over time or if it is fake.

Thanks