This poster looks like an original print on thick high quality paper with great ink saturation. which makes us think it may be a stone lithograph and not an offset poster? There was a stone lithograph signed and numbered version of this poster. Perhaps they used the same stones to print it that were used for the signed and numbered print. The poster measures 27.5 x 18 inches.

Very fresh color and paper, very minor and barely noticeable soft crease and 1/8" tear top left in the dark blue, will frame up beautifully.