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.
Postcard of the old Ship parish house, Hingham, Mass designed by Peabody and Stearns. Postcard from pre-1960, published without copyright notice. From https://ark.digitalcommonwealth.org/ark:/50959/8049gq99b {{PD-US-no notice}}