Heintz Art Metal Shop used the letters HAMS in a diamond as a mark. Otto Heintz (1875-1918) took over the Arts & Crafts Company in Buffalo, New York, in 1903. By 1906 it had become the Heintz Art Metal Shop. It remained in business until 1930. The company made ashtrays, bookends, boxes, bowls, desk sets, vases, trophies, and smoking sets of bronze with the silver decoration applied by a process patented in 1912. The best-known pieces are made of copper, brass, and bronze with silver. In 1902, Otto Heintz designed and manufactured copper items with colored enamel decorations under the name Art Crafts Shop. Some pieces had a colored patina of green, tan, brown, or red. Similar pieces were made by Smith Metal Arts and were marked Silver Crest. Some pieces by both companies were unmarked.