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Postmark - Wikipedia
When Does Mail Get Postmarked by the USPS? A Complete Guide
Postmarked Mail vs. Dated Postage Stamp - VPM Help
Postal marking - Wikipedia
USPS Postmarking Guidelines
some detailed (paranoid?) questions on postmarking : r/USPS - Reddit
PMCC: Introduction to Postmark Collecting
10 Backdating and Pre –Dating - About.usps.com
Postmark Definition & Meaning - Merriam-Webster