Saltiel and Masaltov Zadok

These are my grandparents on my mother's side, Saltiel and Masaltov Zadok. I am not sure where the picture was taken, definetly not in Greece, so maybe in Serbia where they went for holidays sometimes. On the back it says 'Mme. Ida Florentin, Souvenir, 9 Aout 1925', so maybe they sent it to my mother whilst on vacation. My grandfather always had a mustache and beard. Generally, they dressed quite modern for their times. They always used to wear hats when they went out, like in the picture.