First Day of Issue = December 7, 1932
Size: 29.00 mm x 35.00 mm
Quantity printed = 13,920
Perforated 10.00 x 11.50
Print method: Lithography

Issued to shows stages of aviation development. This stamp shows the profile of Leonardo da Vinci. The surtax was for wounded Latvian aviators.

Watermark



Catalog numbers
Scott CB10
Michel LV 211A

For more information check out the links below
Latvian airmail semipostal stamps
Latvian aviation
Leonardo da Vinci