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The US Postal Service did not produce that stamp. The US Post Office Department produced it. The USPS did not come into existence until 1971.
While you are correct with the date the USPS came into existence, the first Love stamp (Scott 1475) depicted in the initial scan was issued on 01/26/1973, so it was after the USPS came into existence!
Now here's another piece of trivia about the first Love Stamp:
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The colors were a homage to Robert Indiana's (the artist's) father, who worked at a Phillips 66 gas station during the Depression. "When I was a kid, my mother used to drive my father to work in Indianapolis, and I would see, practically every day of my young life, a huge Phillips 66 sign," he once wrote. "So it is the red and green of that sign against the blue Hoosier sky."
More history about the artist and the creation of the Love stamp at this link:
http://mentalfloss.com/article/2527...ndianas-love