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Perforation Characteristics for Modern U.S. Stamps |
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| Perforation | Type | Characteristics |
| 11.2 x 11.1 | bulls-eye | perfs meet perfectly at corners and rows are perfectly aligned |
| 10.8 x 10.9 | line | perfs meet unevenly at corners |
| 11.2 x 10.5 | electric eye | perfs meet unevenly at corners |
| 11.2 x 11.1 | comb | perfs meet nearly perfectly at corners and rows are aligned |
| 11.7 x 11.5 | die cut | serpentine cut |
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