First Day of Issue = December 7, 1932
Size: 29.00 mm x 35.00 mm
Quantity printed = 11,720
Perforated 10.00 x 11.50
Print method: Lithography

Issued to shows stages of aviation development. This stamp shows Wright brothers biplane. The surtax was for wounded Latvian aviators.

Watermark
Watermark


Catalog numbers
Scott CB12
Michel LV 213A

For more information check out the links below
Latvian airmail semipostal stamps
Latvian aviation
Wright brothers