1967, painting from Raden Saleh 25r. 'forest fire' in four different COLOUR COMBINATIONS (probably proofs?) in blocks of four from right margins incl. orange-red/olive-green (as issued but margin and picture in reversed colours), red-brown/blue, emerald-green/purple and olive-green/grey, unusual and scarce, mint never hinged (Image)

1969, Satellite communication 30r. with variety GREY instead of red printing block of 15 from upper right corner, unusual and scarce, mint never hinged, unlisted in Michel

1969, Satellite communication 30r. with wrong coloured background in BLUE instead of violet block of 15 from upper right corner, unusual and scarce, mint never hinged, Mi. € 600,-- +