area: Bizonal (Allied Cast) 21D, dentate 11,5 issue reason: 1945 on-Post
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File:Special Delivery 20c 1925 issue.JPG - Wikipedia
The Americans & British in Germany Stamps 1945-1949 (Bizone) - Page 5 - STAMPBOARDS - Postage Stamp Chat Board and Stamp Forum
E14 - 1925 20c Flat Plate Perf 11 - Mystic Stamp Company
Germany, Allied Control Council Postage Stamp Issues 1946/48 – World Stamps Project
Daniel F. Kelleher Auctions, LLC Sale - 749 Page 9
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The Americans & British in Germany Stamps 1945-1949 (Bizone) - Page 5 - STAMPBOARDS - Postage Stamp Chat Board and Stamp Forum
E13 - 1925 15c Flat Plate Perf 11 - Mystic Stamp Company
Germany, Allied Control Council Postage Stamp Issues 1946/48 – World Stamps Project