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Postal Service personnel should strive to furnish clear and legible postmarks to collectors by ensuring that handstamp devices are properly inked. Postal Service personnel must give special attention to requests for light postmarks and to mail bearing an endorsement of philatelic value, and they should avoid postmarking stamps by pen or illegible smudging. However, stamps must be postmarked sufficiently to protect Postal Service revenue. See Exhibit 11–1.
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