Definitely an Albatros D.III. Not sompletely sure about the id of the aircraft,but may be D.629/17 flown by Karl Allmenröder of Jasta 11 based on colour illustrations
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A couple of photos of a Caudron R.11 being blessed by a priest,possibly post war. The insignia of Escadrille 1 was a flying snail,but wherther this is a unit marking or a personal marking here, I' don't know.