Once Upon a Time in the West poster value?
I've been given a poster of "Once Upon a Time in the West", along with a signature of the director, Sergio Leone, to sell for a charity auction. The signature is on a separate piece of card, framed with the poster, not on the poster itself.
I have no idea what it might be worth, or how to tell if either poster or signature are genuine. Obviously, I want to make as much money as possible for a worthwhile charity, but I also don't want to rip the buyer off if it's not genuine, but we've told them it is. I have no idea how much it would be worth if it is genuine, either. I don't know if it's from the original release, or from a later re-release.
A few photos are here: https://www.dropbox.com/sc/71h3cgwilmtfat9/AAB2LBtGh4EczKObn3cKdX0Ia
Any advice as to how to proceed would be very welcome. thank you
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