Wm. Rodgers was purchased by international silver in the late 1800's, but they still used their mark. There is a complex history with silverplate during the End of the 1800's and into early 1900's. International and Oneida bought up so many companies. Wm Rodgers was a well renound name and like many other of their companies they used their hallmark. If you look carefully you will probably see IS stamped next to the Hallmark. This is the stamp of International silver. Second keep in mind, while silverplate was invented in the mid 1800's it really did not take off until the late 1800's and into the Early 1900's, then feel out of favor post 40's.