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| Start / | Knowledge / | Cancellation Kinds / |
| Accidentals | Categories | Changes | Designs | Differences | Errors | Fakes | Issue Occasions | Kinds | Mistakes | Parallel Issues | Quality | Other Postmarks |
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Knowledge / Cancellation Kinds / Machine Postmark Cancellations / Differences |
Machine Postmark Difference: common term for two the same postage stamps with no machine postmark agreement |
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Machine Postmark Text Difference: common term for two the same postage stamps with no machine postmark text agreement |
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Machine Postmark Kind Difference: common term for two the same postage stamps with no machine postmark kind agreement |
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