This is a 17" x 24" poster for the Spanish-American Abstract Expressionist artist Esteban Vicente (1903–2001) and his 1965 Exhibition In NYC.

An American painter born in Turégano, Spain. He was one of the first generation of New York School abstract expressionists.
Esteban Vicente, a member of the renowned "Cedar Tavern" crowd alongside Jackson Pollock and Willem de Kooning. He is best known for his Abstract Expressionist paintings and collages.