How rare is this?

I have an unusual film star lobby "card" no one seems to be familiar with. It's the face of Leon Janney on board, 29" x 24". It was in John Kluge's MetroMedia poster collection that was auctioned in the late 90s or so. You can see it here:
http://www.freewarehof.org/LeonJanney.jpg. I'd like to auction it.