All Puch-Automobiles up to 1918 were equipped with a special, in their own factory developed, "flexible"-flat-radiator, which withstanded small accidents and damages. Very important for use in WW I.
From 1919 on, they used the typical sharp-pointed radiator, instead of the flat-rad before
There were two different types in their pogramme:
They presented an absolute new Type XII 6/20 Alpenwagen, with a wheelbase of 2420mm and new OHC-engine in 1919. Secondly, there was the bigger one Type VIII 14/38 with a wheelbase of 3290mm
In my opinion, you pucture shows the SWB-variant of the two types of the Puch-Alpenwagen:
The Type XII 6/20 (built from 1919-1923)
A similar car is on display at the "Koler Automobil Museum", 60 kilometres from my home (picture attached)