Johan,
I thought I remembered this stamp set being questioned here only recently,
I could not find any reference to it in my database.
I have never come across Chapier's "Les Timbres de Fantasie" either, that sounds like a fabulous book / catalogue.
I'll pop over to Riga's Richard C Witt's Cinderella Pages, see if he writes about them.
Update
Yes he does !
You'll not get much further info though
http://www.cinderellas.info/wittcol...llection.htmscroll down to Arabia