Postal card indicia are valid for postal cards they are printed on. Sometimes, when the indicia on a card is mistakenly not canceled, the indicia is cut out and pasted onto a mailable item, usually a first class letter. This practice is not sanctioned by the post office, however many examples can be found as frugal users of the postal system used whatever postage they had to mail letters.
Thomas Jefferson was not only president and a statesman, he was also a naturalist. He had a keen interest in prehistoric life (fossils) as well as archaeological objects found throughout the United States. His support for expeditions to both map the country and find historical artifacts or fossil remains is unparalleled by any other president.
Jefferson Postal Card Indicia Cut-out
This local rate letter mailed within the city of Buffalo, New York on 4 June, 1928 used a Thomas Jefferson postal card indicia cutout to pay the postage. In this case, postal system personnel caught the attempt and assessed the letter two cents postage due as indicated by the manuscript notation. A precanceled postage due stamp of Buffalo, N.Y. was applied to indicate the missing postage was paid.
The Mesozoic Times 