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Argentina 1935-51 50cNOP

The 50cNOP is an opaque variation of the unwatermark stamp. The paper is thicker than the 50cNGR paper, and lacks the grid pattern. Most 50cNOP stamps are found with comb perforations. Quick links: the issues ( 1E / NGR / NOP / 2 / CL / late issues ( 1L1 / 1L2 / 1L3 / 1L4 / 1L5 ) ) plate varieties: major flaws near the 50 numerals / break at top of V of CENTAVOS / dot after R of MAR / doubled or smudged inner design / major lower edge design shifts / upper edge major inner design breaks / upper left outer corner break / lower outer line breaks