NL43 (M12) 1915 6¢ on 4h green German East Africa Yacht handstamped "G.R. POST 6 CENTS MAFIA" in black, a rare and difficult stamp, very seldom offered and many times rarer than its counterpart in the previous set, considerably undercatalogued, the first used example we have offered in quite a while, well centered, ex-Gibbs, signed Houtzamer.
