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Abbreviations and Terminology
| * | Unused | |
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| 0 | Used | |
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| CV | Cover | |
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| OP | On Piece | |
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| cds | Circular Date Stamp | |
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| WH | Wholesale | |
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| BL | Block of 4 | |
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| SS | Souvenir Sheet | |
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| SH | Full Sheet | |
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| ES | Essay | |
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| B-O-B | Back-of-Book, ie., Postage Dues, Special Deliveries, etc. | |
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| PR | Proof | |
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| SP | Specimen | |
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| FD | First Day | |
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| PB | Plate # Block of appropriate size | |
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© 2006 Earl P.L. Apfelbaum, Inc.
The Pavilion, 261 Old York Road, Suite 831 Jenkintown, Pennsylvania 19046 267-763-0216 800-523-4648