Great thread! The boxing stuff is incredible, Adam! Especially the Cassius Clay.
This is an envelope from Ben Cheney....he used to own the Tacoma Giants and also founded this team (that I didn't know of).
http://www.seattlestuds.com/
He owned Cheney Lumber and the envelope looks like a 2x4. The back of the envelope claims Cheney Lumber was the "Originator of the eight foot stud."