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| APS Affiliate #103 |
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| ATA Chapter #94 |
| Click here for a printer friendly version of this essay. |
72. Spacing and sheet layout varieties: In the first third of the 20th century, the Bureau of Engraving and Printing experimented with different vertical spacing between stamps to try to cut down on waste from inaccurate perforating. Spacing varieties can be identified by measuring the margin or by the presence of special plate numbers and other markings, such as different types of stars. Position pieces can have significant value.
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