Art Nouveau mirror marked "Derby Silver Co., Patented June 4, 1904 - July 26, 1904" The Derby Silver Company made silver plate flat and hollowware in Derby, Connecticut. They were one of the original companies that united to become the International Silver Company in 1898. They also used the name "Derby Silver Plate Company". This piece probably dates from 1900 to 1905. Condition: sides are dented and mirror has shadows, otherwise great preowned condition. Shipped with USPS Prior...ity Mail.