Re Stig's #8 with name of Georg (or Gerhard?) Klauka, also see Nic's website here
https://www.ghostbombers.com/JG200/june_1.html at bottom. 'He would
die in combat two days later', which would make it 25 June 1944 indeed.
On this page however it says he had had an accident and died of burns? See bottom of
https://www.ghostbombers.com/JG200/june_2.html
Leendert