Andy, the main problem is that the Czech planes of fabric skin were coated with a couple of layers of Cellon lacquer what changed the hue of a paint. Therefore the sample of the colour may seem to be lighter. I had to go to my basement for a SuperModel magazine with a list of Czech paints printed. According to the list of colours for the Czechoslowakian AF in 1926-1939, the Avia planes were painted with Light Khaki FS 34082 .. Humbrol 102 or Tamiya XF61. Other manufacturers used Dark Khaki FS 34079 ... Humbrol 116 or Tamiya XF27.