Stamps of Guatemala, 8th General Assembly of Pan-American Geographical and Historical Institute issue
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airmail
1967, Apr 13 8th General Assembly of Pan-American Geographical and Historical Institute issue unwmk (no perf info)
| - | 4c | multi | .20 | |||
| - | 5c | multi | .20 | |||
| - | 7c | multi |
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