A pair of Landsturm Gefreiter from an unidentified unit, circa 1914/15.
Both men are wearing Litewka tunics: In my opinion, a 1900 blue model and a 1903 grey model, distinguishable primarily by the front breast pockets.
Note that the Tschakos have the metal plate painted over in an attempt to make it less conspicuous.
Excellent view of the Gew88’s ammo clip.
Original: B.B. Collection (drakegoodman) via Sam Wouters.