There are no copyright marks. At bottom left is Country of origin USA. At bottom right is This lobby display leased from Famous Players Lasky Corporation.
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.
{{Information |Description=Lobby card for the 1927 film ''Knockout Reilly''. |Source=[http://web.archive.org/web/20160523170052/http://www.ebay.com/itm/Knockout-Reilly-1927-Original-USA-Scene-Card-/142000576713?hash=item210fe4d8c9:g:zDUAAOSwfY9XQLSc eB...