it was published prior to 1 January 1964 (as per the S.25 of The Indian Copyright Act, 1957);
its author died prior to 1 January 1964.
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Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:T_K_Gajjar.jpg
Uploaded a work by Unknown (the person in the image died in 1920 so image must be taken way before that) from https://theprint.in/opinion/tribhuvandas-k-gajjar-the-gujarati-chemist-who-cleaned-queen-victorias-marble-statue/1806787/ with UploadWizard