1929, Albert 10-100 fr. , numbered minister sheet, fine (Image 1) (Image 2) (Image 3) (Image)

1952, Fight against tuberculosis 8f. green as die proof in block format, with artist signature, fine (Image 1) (Image 2) (Image)

4 fr. imperforated proof in brown on horizontal laid paper in block size with engraver signature, unused without gum, fine, rare (Image 1) (Image)