Stamps and covers from the Estate of the late Menachem Niv

Jerusalem 10 mils OTSAR Ha"AM revenue stamp tied to cover addressed to Herzliya, by Israeli trilingual postmark Jerusalem 1. 21.7.1948 the item presumably went through the mail as other recorded examples of this franking were accepted in Tel-Aviv. Apart from a few trains in very good condition. VERY RARE as OTSAR Ha"AM revenues are very seldom offered as accepted for regular postage. Certificate by Y. Tsachor, as well as signed in pencil on reverse. Only a few recorded. VF & extremely rare!!