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postage
1982 1982 provisional issue unwmk (no perf info)
| X | 240s | multi | — | — |
1982, Dec 2 Vilcapaza death 100th issue p. 13.5x13
| X | 240s | blk & ltbrn | Pedro Vilcapaza |
1982, Dec 27 Potato Study Center 10th issue p. 13x13.5
| X | 240s | multi | Potato & center emblem |
1983, Jan 18 TB bacillus discovery 100th issue (no perf info)
| X | 240s | multi | microscope |
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