Austria, 2005, 100 c. 14. multicoloured
Catalogues: Michel: 2520, block 27 Scott: SS 1990 Stanley Gibbons: MS2754 Yvert et Tellier: block 32
This stamp is the first of its kind in the world: the face in the background is made up of microscopic chemical formulae for the steroid (art screen composed of enantiomers of the steroid).
Plots: Djerassi Carl
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