Some of the artists developing Weller's art pottery lines included Charles Babcock Upjohn, the new art director, Frederick H. Rhead, John Lessell, Sarah. How is Weller Pottery Marked? May The marks used by Weller vary as almost much as the styles. Learn to identify and date Weller. 8 The molded Weller Pottery mark on the fake wasn't introduced until Originals are marked by hand. Note the large firing line at left. Forged monogram of.