Fokker D.VIIs
first, the Bulgarian a/c: Bulgaria asked for an armistice in October 1918, but didn’t sign a peace treaty until November 1919 (Treaty of Neuilly). in the meantime the Bulgadian AF continued to fly its’ a/c, but with a new roundel. Obviously there are only B&W pics but I’ve never seen the roundel as being recorded as anything other than red-green-white. (the Bulgarian national colours).
D.VIIs in China; the Manchurian AF received 3 (185hp BMW engined) D.VIIs in 1924 (from Switzerland). I doubt, however, they ever wore the 5-coloured star markings shown, as by that time it seems that the Manchurians were using a 5-ring roundel – from the centre black-white-blue-yellow-red