Oh yes, know them very well. Top photo shows pilot Unteroffizier. Balthasar Aretz (left) and his Bordfunker Gefreiter Rolf Schilleng on their Bf 110 D of 2. Staffel, Erprobungsgruppe 210.
Second photo shows the same two (Aretz left & Schilleng right) at Calais-Marck following the second raid on Croydon airfield on 31st August 1940. This Bf 110 D-0/B, S9+EK, W. Nr. 3568, was damaged in combat and send off to a repair facility. Here it is at the repair facility. You can see the W. Nr. etched on the port side canopy.
The original photos are from the collection of Balthasar Aretz, who very kindly allowed me to copy all of his photos for my book on Erprobungsgruppe 210. I suspect these 'repros' have been lifted from my work. Balthasar Aretz survived the war; Rolf Schilleng was posted missing on a noctural mission off the East Anglian coast on 12th May 1941. Balthasar was wounded in action on 5th October 1940 and hospitalised for about 3 months. Rolf then flew with other pilots.
Here's a photo of Balthasar with Erprobungsgruppe 210 during the Battle of Britain in 1940:
And me with Balthasar at a reunion in the 1980s:
Rolf Schilleng:
Unfortunately, I had one of the worst experiences in all of my research years when chatting to Balthasar one time at a reunion.
He asked me if I knew what had happened to Rolf.
I said 'Yes'.
He asked me if he was still alive, and could I put him in touch with Rolf.
I had to break the news to him that Rolf had been missing in action since 12th May 1941. I cannot describe the abject misery that came across his face for a few seconds. I just had to sit in silence with him...
This is the side of research that people don't see...