The pre-stamped post card from the 1870s posted by Rikki a week or so ago was pretty cool. The second series ever issued by the US Post Office. I found a few older ones in my collection, not nearly as old as that though.
I think a lot of people and businesses bought them in bulk, because there seem to be a ton of unused ones around.
#24 McKinley (~1913)
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login#27 Jefferson ~1914 (back blank)
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login#38 Franklin ~1951 (back blank)
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