Set of 4 lithographs birds 17.5 x 21.5cm old

Set composed of 4 lithos representing birds 50s / 60s to frame: these are advertisements for a pharmaceutical product "hepatior" (advertising mentioned only on the back). Drawing by paul barruel (1901 - 1982): french cartoonist, watercolourist, scientific illustrator and naturalist known for his naturalistic drawings of birds. Dimensions 17.5 X 21.5cm. Very good condition (no folds, no stains, clean), ivory background tint of the paper a little yellowed but uniform. Neat shipment in tracked letter (protected between 2 cardboard sheets to avoid folds).