Mauritius 1904 Madagascar UPU Archive Stationery Specimens

MADAGASCAR UPU ARCHIVE RECEIVING AUTHORITY SPECIMENS: 1904 KEVII Registration Envelopes: 1x 8c, 2x 12c, all overprinted "SPECIMEN" and handstamped with circular "POSTES ET TELEGRAPHES / COLLECTION / DE BERNE / MADAGASCAR" in red. Removed en bloc from the archive ledger sheet. Sent from the UPU in Berne to the Madagascar Post Office where they were defaced with the Madagascar handstamp. Some trivial tone spots mentioned for accuracy. Rare, most attractive.