FD, to further confuse you, it does me. I've emailed a Czech aviation historian to see if clarification is forth coming.
https://weaponsandwarfare.com/2019/0...e-wwii-part-i/
Slovakia used the OK- marking.
https://ww2aircraft.net/forum/thread...arkings.22624/
Last edited by megan; 27th Nov 2021 at 01:53.
Reason: link