The photo has no copyright markings on it as can be seen in the link above, and in the copy of the file showing the back, uploaded separately (as was done in the eBay source link above).
See also w:film still article, which explains that publicity photos were traditionally not copyrighted.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.