Earliest/Latest, First/Last & Proving dates or places (33)
FDC First Day Covers (1)
Object Related Specifically to a Personality or Key Event (13)
Production error (non-stamp) (1)
Significant Addresses / Persons (15)
Significant dates (36)
Small locales (26)
Philately - Air Mail (2)
Uncatalogued / Undocumented varieties (9)
Unique / Discovery items (20)
Philately - Censored Mail (2)
Unusual Origin, Destination or Postal Link (31)
Unusual postal procedures, fines or taxes (14)
Philately - Late Fee (1)
Philately - Military Post Offices or Military Administration (2)
Philately - significant cachets & postal markings (2)
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Philately - Stampless Mail (1)
Philately - Surface Mail (contemporary) (2)
Philately - Unusual Origin, Destination or Postal Link (2)