This set of stamps was issued to benefit Serbian Prisoners of War.

The stamps were issued in 5×5 sheets containing 20 stamps. Those in the first four columns (suffix “A”) are comb perforated 11 1/2 (K 11 1/2) on all sides. Due to the use of line perforations on the right edge of the sheet, those stamps from the rightmost column (suffix “B”) are perforated comb 11 1/2 (K 11 1/2) on top, left, and right, but line 11 1/2 (L 11 1/2) on the right edge.

These blocks of four show a mix of “A” and “B”.  The MiNr. 62 and 63 blocks are all “A”, as are the leftmost columns of the MiNr. 64 and 65 blocks.  The stamps in the rightmost columns of the MiNr. 64 and 65 blocks are “B”.