This is an Edwin Knowles Semi Vitreous china 9" plate. The pattern is of a narrow band of green leaf ivy with tiny dark berries. There is also somewhat faded gold trim. I have not been able to identify a pattern name. There are no chips or cracks, but there are many utensil marks and quite a lot of crazing. The Semi Vitreous backstamp was used between 1920-1939.
Edwin Knowles Plate 9 IN Green Vine Berries Semi Vitreous