Stamps of German Democratic Republic, 1968, missing cat val
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postage
1968, Jan 24 Potsdam Meteorological Observatory 75th issue unwmk (no perf info)
| X | 20pf | multi | map with cloud formations | — | — | |
| X | 25pf | multi | — | — |
1968, Apr 25 Marx 150th issue
| X | 10pf | blk & ol | Communist Manifesto title page | — | — | |
| X | 20pf | multi | portrait | — | — |
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