Southern Nigeria 1912 Madagascar UPU KEVII ½d Cards

MADAGASCAR UPU ARCHIVE RECEIVING AUTHORITY SPECIMENS: 1912 KEVII ½d green POSTCARDS (3) overprinted "SPECIMEN" and handstamped with circular "POSTES ET TELEGRAPHES / COLLECTION / DE BERNE / MADAGASCAR" in red. Affixed to archive ledger sheet headed Nigeria du Sud with count 3 cartes postales de ½ penny received 11 Juillet 1911 which seems to contest the stated H&G issue date of 1912. A unique trio sent from the UPU in Berne to the Madagascar Post Office where they were defaced with the Madagascar handstamp. VF, rare, most attractive.