First Day of Issue = December 23, 1991
Size: 17.50 mm x 25.00 mm
Quantity printed = 170,000
Perforated 10.00 x 11.50
Print method: Photogravure

This is Scott Russia 5985a overprinted with LATVIJA and surcharged 100 kopeks.

Catalog numbers
Scott 308
Michel LV 313II