https://arg3551.blogspot.com/2009/03/comparison-of-1l2-and-1l4-papers.html
The Argentina 1935-51 Definitive Series: Comparison of the 1L2 and 1L4 papers
I am still undecided if the 1L2 and 1L4 are separate papers or the same paper with a small printing run variation. The 50c1L2 is a common st...
series comparison