Canal zone - postal stationery: 1907-1970's ca.: Specialized collection of near
Canal zone - postal stationery
1907-1970's ca.: Specialized collection of near to 150 postal stationery cards and envelopes, from first issues, including more than 100 different of various sizes, knifes, types of overprints, watermarks etc. based on the UPSS catalogue, also Air, and duplicates, all unused, and...