| Title | Body | Owner | Visibility |
| ? | — | — | public |
| ?? | — | — | public |
| 'pr=litho' applies to surcharge | — | — | public |
| 'pr=typo' applies to surcharge | — | — | public |
| **? | — | — | public |
| 1 | — | — | public |
| 1s | — | — | public |
| 2 | — | — | public |
| 2679 | — | — | public |
| 2782//MAZATLAN | — | — | public |
| 3 | — | — | public |
| 3 on piece | — | — | public |
| 4 | — | — | public |
| 481 | — | — | public |
| 5 | — | — | public |
| airmail | — | — | public |
| airmail? | — | — | public |
| also 10c | — | — | public |
| also 15c | — | — | public |
| also 2.5c | — | — | public |
| also 20c | — | — | public |
| also 25c | — | — | public |
| base stamp not yet issued? | Scott & Michel seem to agree that the base stamp was issued 1876, while this overprint is from 1875 - was ovpt applied pre-1876? | — | public |
| Basel Dove | The "Basel Dove" was the first stamp printed in more than one color, and the first to depict an animal. | — | public |
| block4 | — | — | public |
| block4 | — | — | public |
| booklet | — | — | public |
| check issuance | — | — | public |
| check this | — | — | public |
| check this? | — | — | public |
| Columbian 4c blue error | This error of color is distinctly different from the usual ultramarine. | — | public |
| confused | is this supposed to be the cutout of 1847 or the poste locale of 1849? needs fixing | — | public |
| Cuba | — | — | public |
| Cuba | — | — | public |
| date is wrong? | — | — | public |
| diamond dots 369 | — | — | public |
| diff perf in 1888 | — | — | public |
| do both vars exist? | — | — | public |
| do both vars exist? | — | — | public |
| does this really exist? | — | — | public |
| doubtful existence? | — | — | public |
| dubious authenticity | — | — | public |
| error | — | — | public |
| error 1093 | — | — | public |
| forgery? | — | — | public |
| HR001.11 | — | — | public |
| HR002.11 | — | — | public |
| HR003.11 | — | — | public |
| HR004.11 | — | — | public |
| HR005.11 | — | — | public |
| HR006.11 | — | — | public |
| HR007.11 | — | — | public |
| HR008.11 | — | — | public |
| HR009.11 | — | — | public |
| HR010.11 | — | — | public |
| HR011.11 | — | — | public |
| HR012.11 | — | — | public |
| HR013.11 | — | — | public |
| HR014.11 | — | — | public |
| HR015.11 | — | — | public |
| HR016.11 | — | — | public |
| HR017.11 | — | — | public |
| HR018.11 | — | — | public |
| HR019.11 | — | — | public |
| HR020.11 | — | — | public |
| HR021.11 | — | — | public |
| HR022.11 | — | — | public |
| HR023.11 | — | — | public |
| HR024.11 | — | — | public |
| HR025.11 | — | — | public |
| HR026.11 | — | — | public |
| HR027.11 | — | — | public |
| HR028.11 | — | — | public |
| HR029.11 | — | — | public |
| HR030.11 | — | — | public |
| HR031.11 | — | — | public |
| HR032.11 | — | — | public |
| HR033.11 | — | — | public |
| HR034.11 | — | — | public |
| HR035.11 | — | — | public |
| HR036.11 | — | — | public |
| HR037.11 | — | — | public |
| HR038.11 | — | — | public |
| HR039.11 | — | — | public |
| HR040.11 | — | — | public |
| HR041.11 | — | — | public |
| HR042.11 | — | — | public |
| HR043.11 | — | — | public |
| HR044.11 | — | — | public |
| HR045.11 | — | — | public |
| HR046.11 | — | — | public |
| huh? | — | — | public |
| imperf | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| in booklet | — | — | public |
| invert | — | — | public |
| inverted frame | — | — | public |
| inverted surcharge | — | — | public |
| JM001.11 | — | — | public |
| JM002.11 | — | — | public |
| JM003.11 | — | — | public |
| JM004.11 | — | — | public |
| JM005.11 | — | — | public |
| labelled antimonite | Although the stamp says "antimonite", stibnite is the usual name of the mineral. | — | public |
| MEXICO//5179 | — | — | public |
| MEXICO//5180 | — | — | public |
| MK001.02 | — | — | public |
| MK001.10 | — | — | public |
| MK002.02 | — | — | public |
| MK002.10 | — | — | public |
| MK003.02 | — | — | public |
| MK003.10 | — | — | public |
| MK004.02 | — | — | public |
| MK004.10 | — | — | public |
| MK005.02 | — | — | public |
| MK005.10 | — | — | public |
| MK006.02 | — | — | public |
| MK006.10 | — | — | public |
| MK007.02 | — | — | public |
| MK007.10 | — | — | public |
| MK008.02 | — | — | public |
| MK008.10 | — | — | public |
| MK009.02 | — | — | public |
| MK009.10 | — | — | public |
| MK010.02 | — | — | public |
| MK010.10 | — | — | public |
| MK011.02 | — | — | public |
| MK011.10 | — | — | public |
| MK012.02 | — | — | public |
| MK012.10 | — | — | public |
| MK013.02 | — | — | public |
| MK013.10 | — | — | public |
| MK014.10 | — | — | public |
| MK015.10 | — | — | public |
| MK016.10 | — | — | public |
| MK017.10 | — | — | public |
| MK018.10 | — | — | public |
| MK019.10 | — | — | public |
| MK020.10 | — | — | public |
| MK021.10 | — | — | public |
| MK022.10 | — | — | public |
| MK023.10 | — | — | public |
| MK024.10 | — | — | public |
| MK025.10 | — | — | public |
| MK026.10 | — | — | public |
| MK027.10 | — | — | public |
| MK028.10 | — | — | public |
| MK029.10 | — | — | public |
| MK030.10 | — | — | public |
| MK032.10 | — | — | public |
| MX001.11 | — | — | public |
| MX002.11 | — | — | public |
| need real date | — | — | public |
| never issued | — | — | public |
| never issued | — | — | public |
| no district name | — | — | public |
| no district name | — | — | public |
| no district ovpt | — | — | public |
| no visible wmk? | — | — | public |
| non-fluorescent | — | — | public |
| not a "Skipjack bonito" | Scott describes this as a "skipjack bonito", which is not a recognized vernacular name for the species. | — | public |
| not in Scott | — | — | public |
| not issued, 15 in set | — | — | public |
| not postage? | — | — | public |
| note | Included 1 pane of 2d map, 1 pane of 1d map, and two panes of 1/2d O'Clary | — | public |
| note | These propaganda labels were used between 1907 and 1916 by Sinn Fein sympathisers. Regulations forbade their use on the front of envelopes. | — | public |
| note | A protest stamp, legally forbidden on mail The valueis on the back of the stamp. | — | public |
| NZ001.11 | — | — | public |
| NZ004.11 | — | — | public |
| NZ005.11 | — | — | public |
| occ before regular issue? | — | — | public |
| occ before regular issue? | — | — | public |
| on cover | — | — | public |
| on FDC | — | — | public |
| on fdc | — | — | public |
| on fdc | — | — | public |
| on fdc | — | — | public |
| on fdc | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |
| on piece | — | — | public |