Special Characteristics

Earliest/Latest, First/Last & Proving dates or places

FDC First Day Covers

Object Related Specifically to a Personality or Key Event

Production error (non-stamp)

Proofs, Specimens & Essays

Significant Addresses / Persons

Significant dates

Small locales

Uncatalogued / Undocumented varieties

Unique / Discovery items

Unusual Origin, Destination or Postal Link

Unusual postal procedures, fines or taxes