Just my opinion, but...
As long as the "Mummy" doesn't have "Printed in Belgium" (in english) at the bottom you're good, if not, at that price, snap it up. Can't go wrong.
"Quiet Man" seems to be a 6 sheet, being on cards might actually be a reasonable thing to put up with if you knew how it was glued on, and if they used acid neutral card stock. Wouldn't want any of that leaching through. "QM" stuff seems to be very plentiful and surprisingly cheap. I think Wayne fans (if there are any left) don't like it because it's not a western. The re-releases are plentiful as well. Honestly, and imho again, wouldn't pay over $75 without knowing more about its backing. [Edit: 'Cause I'm a cheap bastid].
--Peter