Thanks for the input. If the claims were all made between Jan and July 1942, then according to the records at Asisbiz/Il2, Horn was most likely flying an E-7 up to maybe end of March and then probably an F-2 until August.
I./JG51 then transitioned to FW190a's. If Horn achieved 11 kills in the 109s, it seems odd to me that he didn't have any claims after July 1942 in the better 190s. I found this today - The Rathbonemuseum site
http://www.rathbonemuseum.com/DENMAR.../DKPhotos.html has a photo of Horn and says that 6 Danish pilots were accepted into the Luftwaffe and all were killed in action, which is at odds with the Wiki story. Although if true it might explain why he made no more claims after July 1942. Does anyone have any thoughts on this?
It's a pity there is no detailed information on aircraft he flew.
Thanks