The historic value of EFO-related memorabilia
Article Abstract:
Two stamp collections auctioned recently included error stamps with related memorabilia. A 1962 Canal Zone Thatcher Ferry Bridge in which the bridge color was omitted, and a 1979 John Paul Jones stamp with odd perforation were both sold with accompanying US Postal Service correspondence.
Publication Name: Stamps
Subject: Hobbies and crafts
ISSN: 0038-9358
Year: 1996
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Let's look at them in the dark
Article Abstract:
The US Postal Service coats its stamps with a phosphorescent material, called a tag, which it uses to sort mail by machine. The luminescent overprinting is visible in darkness under ultraviolet light. Untagged error collectors prize stamps that lack this coating.
Publication Name: Stamps
Subject: Hobbies and crafts
ISSN: 0038-9358
Year: 1993
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