You may get more answers about it if you post this in the ‘Memorabilia Discussion and Buying/Selling/Trading’ forum, here - http://originaltrilogy.com/discussion/Memorabilia-Discussion-and-Buying-Selling-Trading/id/8 - mate.
Had to google Yak Face - can’t remember it from the films, though looks cool. Was he in Jabba’s Palace or barge or something like that?