Here are a couple of extremely rare posters that don't turn up very often. Both posters feature Clint's war movies that he made for MGM Where Eagles Dare (1969) and Kelly's Heroes (1970). Both films were of course directed by Brian G. Hutton.
So what makes these posters so rare? Well, both are great examples of the UK Double Crown (30" x 20") versions. Apart from their rarity value (you hardly ever see them surface), expect them to be very expensive when they do show up.