Stamps, 11 Apr 1991
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Portugal
postage1991, Apr 11 Europa 1991 issue unwmk (no perf info)
| - | 80.e | multi | Eutelsat II | — | — | |
| - | 80.e | multi | — | — |
Australia
1991, Apr 11 Insects 1991 issue - insects (1991 Australia) p. 14.25x14.5
| X | 43c | multi | cotton harlequin bug | |||
| X | 43c | multi | Coprosma Hawk Moth Cizara ardeniae | |||
| X | 80c | multi | Leichhardt's Grasshopper Petasida ephippigera | |||
| X | $1 | multi | Jewel Beetle Castiarina producta |
1991, Apr 11 Queen Elizabeth II 65th issue p. 14.5x14.25
| X | 43c | multi | Queen Elizabeth II |
Austria
1991, Apr 11 Spittal a/d Drau issue p. 13.75
| - | 4.50s | multi | Spittal engraving by Matthäus Merian coat of arms-Spittal ad Drau |
Bulgaria
1991, Apr 11 700th anniversary of Confederacy Switzerland issue p. 13
| X | 62s | multi |
Ireland
1991, Apr 11 European Cultural capital issue (no perf info)
| X | 28p | multi | 50 Year Dublin Grand Opera Society scene of La Traviata | |||
| X | 32p | multi | ||||
| - | 44p | multi | ||||
| - | 52p | multi |
Azores region
1991, Apr 11 Europa 1991 issue
| - | 80.e | multi | — | — | ||
| - | 80.e | multi | — | — |
Madeira region
1991, Apr 11 Europa 1991 issue
| - | 80e | multi | — | — | ||
| - | 80e | multi | — | — |
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