US has done this in the past. It was done on the 1975 Contributors to the Cause bicentennial commemoratives and also the Postal Service Employees issue from 1973. Probably some others I forgotten too!
One of the reasons the Bureau of Engraving and Printing purchased the Andreotti gravure press was that it could print on both sides of the web. The first stamp printed with information on the back was the 8c Postal Employees (Scott 1489-1498); FDOI April 30, 1973.
The Classic American Aircraft series also had legends on the back of the stamps. The later Advances in Aviation series had similar legends, but the stamps were adhesive, not gummed, so the text was not on the back of the stamp, but on the back of the stamp backing.
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