This attractive sheet was issued to celebrate the proposed stratosphere balloon flight by Poland.
Released September 15, 1938, it was designed by L. Sowinski and engraved by W. Vacek.Sheet 75 x 125 mm. Perff. 12 1/2 by 12.
“...At once authoritative and compelling." Royal Mail’s British Philatelic Bulletin |hello@philatelicdatabase.com
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