The United States increased postage rates on November 2, 1917 to cover costs of WWI.
This postcard has the correct franking on the first day of usage. It is from a soldier who is, or is soon to arrive, at Camp Taylor, Lousiville, Kentucky.
The card is cancelled by a Universal machine of the main post office of Louisville.
(Some postal history dealers charge a premium for ‘first day’ usages of War Rates, but I believe that these items are not particularly uncommon.)
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