First Day of Issue = September 1, 1920
Size: 31.00 mm x 42.00 mm
Quantity printed = 234,000
Perforated 10.00 x 11.50
Print method: Lithography

This is 0063.jpg surcharged with 10 rubles.

Reverse side of stamp showing that stamp was printed on the back of unfinished 5 rubles bank notes of the Workers' and Soldiers' Council, Riga.

Catalog numbers
Scott 83
Michel LV 55

For more information check out the links below
Workers' and Soldiers' Council