Poland 1921 Aero-Targ 100m blue & black

Poland · 1921 · 100 M.

The stamp features a Junkers F-13 airplane flying over a landscape, with 'POLSKA POCZTA LOTNICZA' at the top and the denomination '100 M.' at the bottom.

These semi-official stamps were issued by the Aero-Targ Company for airmail services in Poland, requiring purchase in addition to regular postage. They represent an early effort to establish airmail routes in post-WWI Poland.