Stamps of El Salvador, 4th National Engineers' Congress issue

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postage

1978, Sep 12 4th National Engineers' Congress issue unwmk (no perf info)
Colnect-4771-591-4th-National-Engineers--Congress-San-Salvador.jpg
- 10c multi

airmail

1978, Sep 12 4th National Engineers' Congress issue
Colnect-3716-382-IV-Congreso-Nacional-de-Ingenier%C3%ADa.jpg
- 25c multi

1 to 2 of 2