Perforation Characteristics for Modern U.S. Stamps
|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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