Flying razor:
I believe this Fok.E.V with the snake on the side of the fuselage is Fok.E.V 142/18, w.n. 2742. Vzfw.
Karl Scharon Fok. E.V 137/18 was taken by the French after the war had the vertically striped fin off Fok.E.V 142/18.
This indicates the possibility that Fok.E.V 137/18 and Fok.E.V 142/18 were most likely in the same unit. Vzfw. Karl Scharon was a member of
2 Marine Feld Jagdstaffel based at Jabbecke Airfield in Northern Flanders with the German 4.Armee.
Blue skies,
Dan-San