unmounted mint Block of Four 3c Deep Violet on thick gray experimental paper (333 var.), mint block of four, never hinged, L. perfs. barely touch on two, otherwise fine , a scarce experimental printing on paper that closely resembles the rare bluish paper, it is well-known to specialists, with 1989 P.F. certificate, unlisted in Scott est.
unmounted mint Block of Four 3c Deep Violet on thick gray experimental paper (333 var.), mint block of four, never hinged, L. perfs. barely touch on two, otherwise fine , a scarce experimental printing on paper that closely resembles the rare bluish paper, it is well-known to specialists, with 1989 P.F. certificate, unlisted in Scott est.
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