Unfortunately no one thus far is interested enough to shell out the $1145 dollars an ebay seller wants for a Buffum Tool catalog so there's a dearth of information about the company
I'll add one. Looks to be a Ford spark plug and cylinder head wrench (I'm assuming it would be a T-5893). I didn't know Buffum made these.
Has 5/8" and 15/16" openings and is 10.9" long.