Stamps of Germany - Berlin, 15 Feb 1974
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postage
1974, Feb 15 Gustav Kirchhoff 150th issue unwmk (no perf info)
| X | 30pf | gray & dkgrn | Gustav Kirchhoff |
1974, Feb 15 Georg von Knobelsdorff 275th issue
| X | 20pf | dkbrn | Georg von Knobelsdorff |
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