This signature is believed to be ineligible for copyright and therefore in the public domain because it falls below the required level of originality for copyright protection both in the United States and in the source country (if different). In this case, the source country (e.g. the country of nationality of the signatory) is believed to be Philippines.
Note that this tag cannot be used on all signatures, as not all signatures are copyright-free.
This work is in the public domain in the Philippines and possibly other jurisdictions because it is a work created by an officer or employee of the Government of the Philippines or any of its subdivisions and instrumentalities, including government-owned and/or controlled corporations, as part of their regularly prescribed official duties; consequently, any work is ineligible for copyright under the terms of Part IV, Chapter I, Section 171.11 and Part IV, Chapter IV, Section 176 ofRepublic Act No. 8293and Republic Act No. 10372, as amended, unless otherwise noted. However, in some instances, the use of this work in the Philippines or elsewhere may be regulated by this law or other laws.
This work is in the public domain in the Philippines and possibly other jurisdictions because it is one of the following types of works that are not protected by copyright, under Section 175 of Republic Act No. 8293 or the Intellectual Property Code of the Philippines:
Any idea, procedure, system, method or operation, concept, principle, discovery or mere data as such, even if they are expressed, explained, illustrated or embodied in a work.
News of the day and other miscellaneous facts having the character of mere items of press information.
Any official text of a legislative, administrative or legal nature, as well as any official translation thereof.
The author died in 1948, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 75 years or fewer.
You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
Note that a few countries have copyright terms longer than 75 years: Mexico has 100 years, Jamaica has 95 years, and Colombia has 80 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term.