Top row: Vera Menchik, Ludmila Rudenko, Elisaveta Bykova (Elizaveta Bikova)
Bottom row: Olga Rubtsova, Nona Gaprindashvili, Maia Chiburdanidze
For more about the events in which they won their titles, see my index page World Chess Championship for Women. The photos were in a set that included the male world champions, Steinitz through Kasparov (although Capablanca is missing from the set I'm looking at), thereby dating their publication to no earlier than the mid-1980s. The description of the set said,
From the U.S.S.R. Ideal for framing and display in chess clubs and chess study rooms.
I'll be back in a week with the regularly scheduled post.