Avis III

The Avis III was developed in parallel to the Avis II and flown for the first time in 1935. It was powered by a 550hp Manfred-Weiss built Gnome-Rhône 9Krsd Mistral engine and was equipped with a three-bladed adjustable-pitch Hamilton standard propeller.

Unlike it's predecessors, which were all of them made entirely out of metal, this one had wooden wings with a combination of plywood and fabric skinning in order to make it lighter. Four prototypes were built and they performed better than the preceding ones, but they lacked the agility of the Italian Fiat Cr.32, which was under evaluation by the Légüyi Hivatal. It was adopted into service but didn't enter into production.
It was armed with two 7,62mm Gebauer machine guns and, apparently one of the prototypes was completed with some minor modifications as the Avis IV. Unfortunately, we couldn't even find textual descriptions of these changes.

Sources:
1. Salamander Books - The Complete Book of Fighters
2. Hikoki Publications - Hungarian Eagles 1920-1945