I have a signed lithograph 163 of 175 that has the following written
in the top right corner and I need to know who the artist is.

"firenze et la pom me sur un ane"

I can not read the signature. It appears to be something like tosiane?

I suspect this isn't going to be easy; but it might help if you could
provide some brief description of the actual print, or better still
post the image somewhere on the internet.