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| Start / | Knowledge / | Postal Shipments / |
| Additional Frankings | Categories | Changes | Differences | Double Frankings | Doubtful Cases | Kinds | Fakes | Parallel Issues | Quality | Validations | Other Frankings |
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Knowledge / Postal Shipments / Frankings / Validations |
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Postage validity period: period specified by a postal administration during which a postage stamp may be used for franking |
Valid for postage: postage stamp that is recognized as franking for a postal shipment |
Invalid postage: postage stamp that is no longer recognized as franking for a postal shipment |
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Valid for postage in two postal areas: postage stamp that is recognized as franking for postal shipments in two postal areas (e.g. Romania and Yugoslavia) |
Mayfly: philatelic term for postage stamps that were only sold at the post office counter or were valid for postage for one day |
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Franking with invalid postage stamps: postal shipment franked with postage stamps that were no longer valid for postage |
Franking with partly invalid postage stamps: postal shipment partly franked with postage stamps that were no longer valid for postage |
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