A copy of Portée de Chats (Paris, 1958) was donated to the store last week. Siné was Maurice Sinet (1928–2016), a political cartoonist who worked for the French satirical magazine Charlie Hebdo. *
I priced it at $10, walked out to the Books, and a customer bought it right out of my hand.
(Shame: reading further in his Wikipedia page, I see he was fired for anti-Semitism.)