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 1 March 1989 without copyright notice or before 1964 without copyright renewal or before the source country established copyright relations with the United States,
it was in the public domain in its home country (France) on the URAA date (1 January 1996).
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
It was in the public domain in France on 1 January 1996. At that time, the copyright term was 50 years post mortem auctoris and a wartime extension of maximum 8 years and 120 days for works published after January 1, 1921 (works published before January 1, 1921 are in the public domain in the US too).