1990 'Population Day', unissued stamp (denomination 10t) with similar design as issued stamp (denom. 6t), fine marginal block of four (apart from weak wavy structure in margin), MNH. This essay was printed by Kniga USSR printing press (while the Issued was printed in Dacca), and only one sheet of 50 was sent to Bangladesh Post Office. As they did not return to USSR finally, several (but seems to be less than 30) copies have survived. A great rarity of Bangladesh stamps. (Image)