That's Hamburger Harry out of Daytona.

http://www.burgerweb.com/hamharry.htm

he used to sell hatpins on eBay and he sent along a postcard with him on his Hamburger Harley when I bought some.

http://www.burgerweb.com/harley.htm

http://www.burgerweb.com/specifications-and-credits.html

this is the pic on the postcard...when he was apparently much younger