This picture was taken in the Rainer-Museum located in the Hohensalzburg Castle by our friend Herr Doktor J-P Weisswange.
It shows a Feldwebel and a Hauptmann of the Austrian K.u.K. Infanterieregiment Nr. 59 “Erzherzog Rainer” with an 3,7 cm-Infanteriegeschütz around 1916.