1970 ies Motorcycle racing lithograph - identify artist from signature

Hi

I am trying to identify the artist of a set of four lithographs of famous British motorbike racers - I have attached some photos of one of them, including the signature.

I only other information I have is that he/she could be Belgian or French because I brought them in a Belgium Flea Market and each has a mark "EA" which means in French "Eprouvee d'Artist" - which means that this particular copy was the one that the artist approved before the official print run started.

any help in identifying the signature would be appreciated (I have trawled Google!)

thanks

Paul