First Day of Issue = July 19, 1941
Size: 17.50 mm x 25.00 mm
Quantity printed = 96,000
Perforated 10.00 x 11.50

Russian stamps overprinted with "LATVIJA 1941. 1. VII" and issued under German occupation.

Catalog numbers
Scott 1N16
Michel DE-LV3

For more information check out the links below
German Occuptaion