France Catalogue Opinions

There's a wide range of shades in the post-WWII engraved issues for the Colonies, which catalogues don't usually differentiate.

From Wikipedia:

"In 2004, Dallay was convicted by a court of justice of forgery and unfair competition for the use of Yvert numbering system which was first used in 1895. In March 2005, after arbitration by the French Conseil de la Concurrence (Competition Commission), Yvert et Tellier began to license the right to print an index of Yvert stamp numbers at the back of competitors' catalogs. Dallay began using the index starting with the 2005-2006 edition."