Measure about 16"x23".
The only signs of wear are some light wrinkles (from shipping) on the sides of the poster, outside the red border.
These are unused posters. Eltra sold Converse in 1979 and these have the Eltra stamp. My guess would be that the image itself is from the 1978-79 season.
A beat up one just sold on eBay for $35 shipped.
$40 each (firm) - ships only to USA.