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| Start / | Knowledge / |
| Changes | Differences | Kinds | Parallel Issues | Safety Measures |
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Knowledge / Coatings / Changes |
Coating change: the same postage stamps issued chronologic with different coatings |
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Varnish bar introduction: the same postage stamps issued chronologic without and than with varnish bar |
Varnish bar omission: the same postage stamps issued chronologic with and than without varnish bar |
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Edition 1899: without varnish bar |
Edition 1904: with varnish bar |
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