The Argentina 1935-51 Definitive Series
A Stamp Collecting Blog Dedicated to one of the Most Interesting Series of the 20th Century
Saturday, December 18, 2010
This clay paper has the thickest coating, and in the type of back scans I use, the watermark is very difficult, if not impossible to see. I find use in 1943 and 1944, but mostly in 1945.