Gertrud Amon Natzler (July 7, 1908-June 3, 1971) was an Austrian-American ceramicist whose collaboration with her husband Otto Natzler helped elevate ceramics to the status of fine art.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Gertrud_Natzler
Bell with clapper and ornament by Gertrud Natzler
1962–1965 / Ceramic / 12-1/2″x8″ / Fine Arts Museums of San Francisco, CA
Gertrud Natzler on Artnet: http://www.artnet.com/artists/gertrud-natzler/