Stamps of El Salvador, 18 May 1981
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1981, May 18 150th Anniversary of the Birth of Heinrich von Stephan issue unwmk (no perf info)
| - | 15c | Heinrich von Stephan | ||||
| - | 2col | Heinrich von Stephan |
1981, May 18 1981 surcharges issue
| - | 50c | multi | ++on=80c | |||
| - | 1col | multi | ++on=70c |
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