My dear Deltafan,What is the year of the book ?
I've been looking for the real-life inspiration for the fictional Savoia S.21 from "Porco Rosso," and this is the closest match I've been able to find yet. A lot of people cite the Macchi M.33 as the basis for Porco's plane, but the Potez 453 more closely resembles the S.21's distinctive layout.Potez 453
French fighter flying boat prototype
source
-le fanatique de l'Aviation unknown issue
from "Icare: La conquête de l'Atlantique nord , tome 2: la France"1996Hi!
Potez CAMS 161.
Please take care retractable stabilizing floats and retractable radiators.
Surprisingly this flying boat had wing skin cooler!!
http://www.airwar.ru/image/idop/flyboat/pcams161/
https://www.wikiwand.com/en/Potez-CAMS_161
https://commons.m.wikimedia.org/wiki/Fileotez-CAMS_161_cutaway_L'Aerophile_December_1941.jpg