First Day of Issue = September 5, 1933
Size: 37.00 mm x 23.00 mm
Imperforate
Print method: Lithography

The surtax was for wounded Latvian aviators. The stamp shows a Graf Zeppelin over Riga.

Watermark



Catalog numbers
Scott CB23a
Michel LV 230B

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