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.
{{PD-because|Widely published before 1978 without a copyright notice.}} Cropped image from advertisement for slidewell bowties that was widely circulated circa 1950. from http://www.antekprizering.com/slidewellbaksi.html
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