English: 1950, per copyright notice. Note that the film itself premiered earlier, in December 1949.

English: Scan via Heritage Auctions. Cropped from original image, retouched by uploader; see unretouched original in upload history.

English: "Copyright 1950 – United Artists Corporation."

English: The poster included a valid copyright notice, seen at bottom left. However, the copyright for the artwork was not renewed, as was required by American copyright law to extend/maintain protection for works published 1963 or earlier. See the Copyright Catalog (1978 to present). In order to maintain copyright protection, the poster would have had to be renewed 28 years after publication. Because it was not renewed, copyright lapsed at that time. Note that the poster art is a distinct work from the film it represents and had to be renewed separately.