Duncan & Miller, in the context of antiques, is commonly used to refer to glasses manufactured by the famous Pennsylvania based glass company, Duncan and Miller Glass Company (or Duncan and Sons Company). The Company was founded by George Duncan and some of his family members in 1865. The company produced glass wares were known as "Duncan glass" or "Duncan Miller glass." Duncan & Miller glass wares were found in beautiful patterns and in attractive colors. Blue, chartreuse, or pink and blue opalescent were some colors that were used.