Koch, Barney, field post at sea 1904-1907" Ar fair shipãs mail, German-south west-Africa, , 1981, 67 S., with illustration in good condition. (Ex Libris stamp) in addition to it Ar fair the collector German colonial postal stamps, German protectorate and foreign countries post offices, valuation the postmark" 11. Edition, 1977, 48 S. In good condition. (2 Ex Libris stamp)