There is little uniformity apart from the colorful camo, as both chassis and turrets are quite varied. I have been able to find only a reference on Mata y Marín book. The similitude in manufacturing with the Girona series is noteworthy (overlapped plates, radiator..) and even on the same parade -or at least documental- we find Girona 5
So if anyone wants to jump in, here are the captures:
The engine bay of this vehicles is longer than the rest, the one behind it looks like a “5”;
This one below is a short one (¿Bedford? ¿Any other COE (Cab over Engine) chassis?
Both are almost equally manufactured to Girona 5 except for some details like the third forward hatch and radiator. Note that the second vehicle of the first photo looks like a colored Girona 5…
I love this captures because they destroy the myth of grey “Tiznaos” . Look that the side of the first Girona 6 is an impresionist landscape even with mountains! art in the factory.
Will keep rantingJ