unmounted mint 3c Deep Violet on thick gray experimental paper (333 var.), three mint singles, never hinged, each natural s.e. at T., centered to L., perfs. touch or barely in on two, very good-fine lot, a scarce experimental printing on paper that closely resembles the rare bluish paper, it is well-known to specialists, each with 1989 P.F. certificate, unlisted in Scott est.