This image is a screenshot from a public domain trailer for the 1951 film, <i><a href="https://en.wikipedia.org/wiki/Little_Big_Horn" class="extiw" title="en:Little Big Horn">en:Little Big Horn</a></i>. 
Trailers for movies released before 1964 are in the Public Domain because they were never separately copyrighted.
Screenshot by Wayne77
Trailer of the Western Legend series (Sidonis Calysta)