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| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Gums / Differences |
Gum difference: common term for two the same postage stamps with no gum agreement |
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Gum colour difference: common term for two the same postage stamps with no gum colour agreement |
Gum kind difference: common term for two the same postage stamps with no gum kind agreement |
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Gum quality difference: common term for two the same postage stamps with no gum quality agreement |
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