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L = Tela, of English origin, the parallel watermark with an asymmetrical paper mesh and coated. But above all with a density of 24/20 instead of 30/20! Introduced in 1949. Reference for the commemoratives: MT 504, 506 = 17.08.1950 San Martin Centennial 20c, 50c |
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When the "rayado vertical" is denoted by Pettigiani by "K"and the "Tela" by "L, the difference is barely visible unless one uses sophisticated methods. The rayado vertical shows asymmetrical diagonals - hence has a asymmetrical paper mesh, the Tela has a symmetrical paper mesh! The 50c coated paper with S.O. on parallel watermark, symmetrical paper mesh, horizontal direction of paper - "m":
The 50c coated paper with S.O. on parallel watermark, asymmetrical paper mesh, horizontal direction of paper - "m":
Some more parallel!
It looks like we have 2 types of paper for the coated 50c S.O. |
