First Day of Issue = June 17, 1932
Size: 36.00 mm x 30.00 mm
Quantity printed = 8,000
Perforated 10.00 x 11.50

The surtax was for the Latvian Home Guards.


Catalog numbers
Scott CB8a
Michel LV 205B

For more information check out the links below
Aizsargi (Home Guard)
Latvian airmail semipostal stamps
Latvian aviation