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Stamp Collectors Against Dodgy Sellers
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| Perforated Stamps Commonly Trimmed to Look Imperforate | |
| This stamp can be trimmed | to resemble this stamp, |
| 18 | 5 |
| 24 | 5, 6, 7, 8, 9 |
| 28, 29 | 12 |
| 35 | 13, 14, 15, 16 |
| 300 | 314 |
| 303 | 314a |
| 304 | 315 |
| 319 | 320 |
| 319c | 320b |
| 319f | 320a |
| 367 | 368 |
| 370 | 371 |
| 372 | 373 |
| 453 | 459 |
| 500 | 482a |
| 527 | 533 |
| 528b | 534b |
| 543b | 534b |
| From How to Detect Damaged, Altered, and Repaired Stamps, Paul W. Schmidt, 1996 | |