It's time for another show-and-tell! Today's topic -- the Independent State of Croatia (Nezavisna Država Hrvatska or NDH)
Model Airplane Exposition of 1942.
On 25 March 1942, the Croatian Wings, an organization devoted to model airplanes, opened an exposition in Zagreb, Croatia. To commemorate the Expo, a series of stamps was issued depicting model airplanes, with the surcharges going to benefit Croatian Wings.

The stamps were printed in sheets of 24 or 25. The sheets are identical, except the sheet of 24 substitutes a Croatian Wings Coat-of-Arms at Field 13.




At Field 12 of each sheet, a single stamp bore an engraver's mark. The marks are the numbers "1", "9", "4", and "2", to commemorate the year, but the "4" and "2" are out of order if you place the stamps in value order (OOPS!).

On the same day, two souvenir sheets were issued featuring the same stamp designs but in slightly larger size, with larger values and changed colors.

About 10% of the imperforate sheets feature an engraver's mark, either an "R" or "V" in the lower right corner of the 2K or 3K value, respectively.


In addition to the issues released to the public, the NDH also issued a small number of Minister Albums which featured a number of varieties not released to the public. These included:
Imperforate varieties of the four basic issues

Proofs on chalky white paper

Proofs of the souvenir sheets with different color combinations and stamp arrangements



And large uncut sheets containing four souvenir sheets (I only have these in sheets of two).
