English: 1946, per the copyright notice. Note that the film itself was released in December 1945.

English: Scan via Heritage Auctions. Cropped from original image.

English: Illustrator unknown. "Copyright 1945 Twentieth Century–Fox Film Corp."

English: The poster carried a valid copyright notice at bottom center. However, copyright for the artwork was not renewed, as was required by American copyright law to extend/maintain protection for works published 1963 or earlier. In order to maintain copyright protection, the poster would have had to be renewed 28 years after publication, in either 1973 or 1974 (see the sections for "Artwork: Original registrations and renewals" and refer to the links to search the copyright catalogs for those years). 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.)