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Research uncovers new details about use of invalid stamps
Are you allowed to use those stamps for postage? - Linns Stamp …
can I still use this slightly damaged stamp? : r/USPS - Reddit
DMM Revision: Invalid Postage - About.usps.com
A guide to correcting Notary certificates | NNA
Invalid postage on domestic U.S. mail from 1954 to the present
Stamp errors explained: The definitive guide to rare error stamps
What Makes a Notarized Document Invalid: Avoid Rejected …
How to fix a bad Notary seal impression | NNA - National Notary Association
Avoid Costly Mistakes: Mastering PE Stamp Requirements
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