I don't have to tell you what's written on his wallet...

You already know what it says. Found this blog today that specializes in vintage biker culture photography as well as vintage racing, rock and roll and more motorcycles. The above is from an entry on the black motorcycle clubs from California in the 60's. Below are some random favorites I ran across. Check out The Selvedge Yard. Be sure and read the aformentioned entry and the one on Photographer Danny Lyon's series "The Bike Riders". Great pictures throughout.