Jaws foyer board

BRS1984

hi guys, I’m after some help. I’ve recently been gifted an “original” jaws foyer board (27x40). I’ve been told that it was taken direct from the cinema after its first screening. I’ve never seen one printed on cardboard so is it authentic? Also, does it being on board make it less valuable than a paper poster?
thanks in advance,
BRD

Charlie

Pictures will help us!

jayn_j

definitely pictures.  27x40 is immediately suspect since 1 sheets at that time were 27x41.  Is the artwork different than the 1 sheet?