First Day of Issue = December 7, 1932
Size: 39.00 mm x 25.00 mm
Quantity printed = 12,020
Perforated 10.00 x 11.50
Print method: Engraved

Issued to shows stages of aviation development. This stamp shows Blériot monoplane.

Catalog numbers
Scott CB13
Michel LV 214A

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