Yup, it is Tunis
Here's the unaltered image. Direct flights to Ajaccio back in the day.
I've been doing some further browsing of the book I've got access to, and I came across a similar plan for the seaplane base at Ajaccio that I thought I'd share;
As you may guess, there might be some more "Which Aerodromes" coming from this source.
There are also maps of routes
and a fair number adverts for aeroplanes
Over to you I42.