English: Message side of printed postal card acknowledging order for a 1939 Oregon Trail Memorial half dollar set. Neither side bears a copyright, and this would have been sent to anyone who successfully reserved a set.
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 ={{en|1=Message side of printed postal card acknowledging order for a 1939 Oregon Trail Memorial half dollar set. Neither side bears a copyright, and this would have been sent to anyone who successfully reserved a set.}} ...