Vintage 1950's Poster Print Lithography Coca Cola Quality 5¢

Description

This is Vintage 1950's Poster Print  or Lithography or old Copy of Coca Cola Quality Carries on 5¢, 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 from around 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 41.5 x 29 cm. Thickness is around 1
mm.