First Day of Issue = September 5, 1933
Size: 37.00 mm x 23.00 mm
Quantity printed = 8,420
Perforated 11.50 x 11.50

The surtax was for wounded Latvian aviators. The plane is a Dornier DO X.

Watermark



Catalog numbers
Scott CB24
Michel LV 231A

For more information check out the links below
Dornier Do X
Latvian airmail semipostal stamps
Latvian aviation