Minerva armoured car. It was not the first, but it was one of the earliest armoured cars, and it was pretty primitive — pretty much just an open-topped steel box on a strengthened touring car chassis. The crew is quite exposed, especially when operating the machine gun.
The model is 1:100 (15mm) scale, from Peter Pig. The number painted on the side is there just to break up the blankness a bit; I don't really know much about the markings used on the actual vehicles. Since it's destined for Imaginaristan "Back of Beyond" skirmish gaming and not a museum diorama, that really doesn't matter a great deal.