Vintage 1950's Poster Print Lithography MUCHA Chocolat Mexican Masson

Description

This is Vintage 1950's Poster Print  or Lithography or old Copy of MUCHA Chocolat Mexican And Chocolat Masson, I don't understand from paper so I can't tell what kind paper is this. The person that give me this paper told me that was framed on wall in Restaurant in Bulgaria. And it was may be from 1950's. The poster is made of
paper And is glued on thick Cardboard. I don't understand from paper for that I make close photo to see
Size only of poster is 35 x 29 cm. Thickness is around 1 mm.
Please see all 12 photos they are the best descriptions!