First Day of Issue = April 30, 1920
Size: 27.50 mm x 32.00 mm
Quantity printed = 1,888,814
Perforated 10.00 x 11.50

SATVERSMES SAPULCES PEEMIŅAI translates to IN MEMORY OF THE CONSTITUTIONAL ASSEMBLY

Catalog numbers
Scott 71
Michel LV 43A

For more information check out the links below
First Constitutional Assembly