Re: the Nieuport -- it is indeed the Nieuport XII of esc N68 shot done by Kurt Wintgens on 20 May 1916, for his 4th confirmed victory. He wrote about the unusual upper wing makings in a letter home:
My fourth was a 'Nieuport avion de chasse' of the latest type and with a new marking on the upper wing [not the usual cockades]...
More in The Blue Max Airmen, Vol 2