La Editorial Mateu de Barcelona did publish at least 5 books in 1959 named:

1: El Escudero de Sir Gawain
2: El Macho y la Hechicera
3: Ilene o la muerte
4: Cabellero de la table rondonda
5: El caballera errante

These are thick, but small HC books, 205 pages. Copies of the Max Trell stories. I am not sure if titel 4and 5 are really 4 and 5 in this serie. The serie is called "concentenaris de illustraciones". Value: Euro 20







Book 1

Book 3

Book 5

Book 2

Book 4