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Largest collection of postal history memorabilia (museum)

Largest collection of postal history memorabilia (museum)
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Who
Smithsonian Institutuion's National Postal Museum
Where
United States (Washington DC,)
When
2000
The Smithsonian Institutuion's National Postal Museum's philatelic and postal history collection holds 13,257,549 items. In addition to stamps, the museum has postal stationery, postal history material and pre-dated stamps, vehicles used to transport the mail, mailboxes, meters, greeting cards, covers and letters.