The image is in public domain. This means that you can dispose of the image at your will. For an explanation of what is considered public domain, see this wikipedia page.
This notably applies to the following:
- anonymous documents published in Japan more than 50 years ago (see an explanation of Japan's copyright law);
- documents published in the US without copyright notice before 1977 and documents published in the US with copyright notice before 1963 whose copyright was not renewed;
- anonymous documents published in most other countries (e.g. France) more than 70 years ago.