This is a Heinrich (H & Co.) Christine line, “Arcadia” pattern bread & butter plate. This pattern was manufactured from 1930 until 1939 in the Selb region, Bavaria, Germany.
I have seven (7) of these plates for sale, each one separately. Four of them are 6-3/8″ in diameter and three of them are 6-1/8″ in diameter. All of them are in very good, used condition.
Take a look at the pictures, and if you have questions, please e-mail.