If you want to authenticate a Picasso you have to contact the Picasso Administration.
It's opinion bears the name of Claude Picasso, claiming to his moral rights.
In the name of the Picasso admin, He say if a work is by his father or not, claiming to his eye and the relation to him...
Well, maybe we can accept that he had a close relation to the artists, but in a recent interview his mother Francoise Gilot, explains a few facts:
1.- Claude was born in 1947, when he was 6 years old his mother and Picasso Broke...
2.- In 1964 (when Claude was
17 or 16 if we take his mother's word) they ended any relation with his father.
3.- Claude and Paloma were not allowed to assist Picasso's burial (Picasso's asked Jacqueline to denied the access).
4.- The last time Claude Picasso saw his father he was 16 or 17 years old.
How can Claude be an expert in his father's work claiming his near relation to him?