Aden PPC used as German Marineschiffspost (MSP2) / marie mail, with MSP2 cancel upper left from the Transportdampfer / Transport Steamer "Pisa" transporting German's home from the Boxer Rebellion. With the cash-paid '5' lower left, since the supply of 5 cent stamps had been exhausted -- the 5pf stamp was then later applied by the Marine Postbureau in Berlin, which is why it bears a Berlin C3 CDS. Slightly worn, top condition. '23 CV EUR2000