Regular First Class Rate from Puerto Rico
This cover, while a bit ratty, shows the WWI War Rate (three cents for a first-class letter) used from Puerto Rico to Washington, DC.
The cover is cancelled by a Universal machine of San Juan.
Many collectors of U.S. postal history may be unaware that postage to and from Puerto Rico has been the same (and used the same stamps) as mail within the contiguous 48 states. This includes the WW I era.
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