![]() | First Day of Issue = May 14, 2013 Size: 85.00 mm x 65.00 mm Quantity printed = 30,000 Perforated 10.00 x 11.50 Print method: Lithography Creative team Arta Ozola-Jaunarāja, Designer 150th anniversary of the birth of chemist Paul Walden. Catalog numbers Scott 832 Michel LV Block 32 For more information check out the links below Pauls Valdens |