Hallo Reinhard,
thanks for the info,
as You indicated that they were from may 1917 with the 4th Army, a German map of the airfield of Nieuwmunster (Neumünster, Houttave) dating from July 1917, mentions in red: anlagen der Kampfstaffel 23.
Would like to know more about their activity at that time
regards,
Cnock
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