Took some time but I have cracked it......
Hans Friedrich Kaiser, born 17.5.1911 in Exdorf, married Charlott Dieckhoff, born 8.12.1920 on 25.7.1942 in Lipburg, Baden.
Why he had a double-barrelled name after marriage?
All his documents simply say Hans Kaiser, however in Jochen Prien's JG 77 work for his 2 victories he is mentioned as Hans Kaiser-Dieckhoff and also in the the known Me 262 pilot list.
Only took 9 years
/Ian