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postage
1956, Aug 21 stamp 100th issue unwmk (no perf info)
| - | 2.40p | Corrientes Nr6 1857 |
1956, Sep 15 liberation 1st issue
| X | 2.40p |
1956, Nov 30
| X | 2.40p | brn | Ameghino |
1957, Mar 2 Brown death 100th issue
| - | 2.40p |
official
1957 1957 official issue
| - | 2.40p | brn |
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