JLHare
Full name of artist might be helpful to someone helping.
Jorge Maria Lubary
Thank you :) I now managed to find an interesting page about Jorge Maria Lubary. The text mentions a medal of Sarah Bernhardt:
"Sara Bernhardt, Anatole France y otros personajes
Años más tarde tuvo otros logros muy comentados en su época. Uno fue cuando en 1905, hizo su tercera visita a Buenos Aires quien era la cumbre de la jerarquía dramática: Sarah Bernhardt. La “Divina Sarah”, ya sexagenaria, se presentó, como siempre en forma exitosa, en la antigua Opera y Lubary le rindió homenaje con una moderna medalla que presenta la efigie de perfil de la eximia artista, reflejando en su diseño la cultura francesa que estaba en boga en nuestro país en los más variados campos."
Translated to English:
"Sara Bernhardt, Anatole France and other characters
Years later he had other achievements very commented in his time. One of them was when in 1905, the top of the dramatic hierarchy, Sarah Bernhardt, made her third visit to Buenos Aires. The “Divine Sarah”, already in her sixties, was presented, as always successfully, at the old Opera and Lubary paid tribute to her with a modern medal that presents the effigy in profile of the exalted artist, reflecting in its design the French culture that was in vogue in our country in the most varied fields."

I think this medal might be the one he made of her, but I am not a 100% sure. Here (above) are some portraits of her for comparison, what do you think?
(The two marked with red and “1905” are from the year the medal of Sarah Bernhardt was made.)