Barcelona’s fair, Spain.

XXVI Feria Oficial E Internacional De Muestras, en Barcelona, 1-20 Junio, 1958." XXVI Official and International Trade Fair, in Barcelona, 1-20 June 1958.
This regal and industrious poster advertises a massive trade fair (or technically defined as fair of samples) in Barcelona. Triton, the son of Poseidon, blows his famous conch shell, meant to raise the seas. 
Artist: Domenech
Size: 97x67 cm
Made in Spain
Material: paper
Printer: Seix y Barral-Barcelona
Condition: as seen on the pictures with folding marks.
This is not a recent issue, replica or tourist souvenir.