I found this Farley sheet interesting and thought I'd share:

It was signed by Walter Scott, son of JW Scott of Scott Album fame. Walter Scott was named to the American Philatelic Society Hall of Fame in 1950. He was a famous stamp auctioneer and sold the collection of E. H. R. Green, who was the collector who bought and split up the sheet of inverted jennies.
http://stamps.org/HOF-1950