I should have read about her before my first reply. What an amazing artist. Lehner show’s only one mark that they know of. A large F with the beginng of the F a slightly longer line. next to it a line beginning higher then the F line and ending at the 3rd line of the F. This mark was found on only one piece at an exhibit. From what I read, a lot was’nt marked. her ending of her clay pottery was her “signiture”. She had a lot of potter’s working with her and they are carring on her work. My question would be ‘did she make it or one of her student’s?