100 years of German postage stamps - postage stamps used, catalog

13 Most Valuable Postage Stamps in the U.S. and the World

Postage stamps of Ireland - Wikipedia

Daniel F. Kelleher Auctions, LLC Sale - 790 Page 20

Germany: 1989 - Sights - 100 Pf - Used Stamp on eBid United States

Stamps That Are More Worth Used Than Unused

Four auction stamps appeared on November 2, 1953 with the portraits of the Protestant pastor August Hermann Francke, the Catholic pastor Sebastian

Welfare: helpers of humanity - stamps used, catalog no. 173-176, Bund

M8030 - West Germany Collection, Set of 950 Stamps, Used - Mystic

Sparks Auctions Sale - 33 Page 76

Encoding Correspondence: Postage stamps, seals, and postmarks

File:German postage stamps on album pages-2.jpg - Wikimedia Commons

Postage stamps and postal history of Spain - Wikipedia