This photo published before 1946 is in the public domain in Trinidad and Tobago and the US because the Copyright Act 1985 that was in effect at the URAA restoration on 1 January 1996 had a term of 50 years after publication for photographs.
Note: The Copyright Act 1997 and its amendments were not retroactive: "This Act shall also apply to works made, performances given, sound recordings made and broadcasts first transmitted before the date of the coming into force of this Act, provided that the term of protection had not expired under the Copyright Act, 1985"
This work is in the public domain in the United States because it meets three requirements:
It was first published outside the United States (and not published in the U.S. within 30 days),
It was first published before the source country established copyright relations with the United States on 16 August 1988.
It was in the public domain in its home country (Trinidad and Tobago) on the URAA date (1 January 1996).
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The copyright situation of this work is theoretically uncertain, because in the country of origin copyright lasts 50 years after the death of the author, and the date of the author's death is unknown. However, the date of creation of the work was over 100 years ago, and it is thus a reasonable assumption that the copyright has expired (see here for the community discussion). Do not use this template if the date of death of the author is known.
Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.