I have an old Greenwood China oval plate or relish tray. It is ornately decorated with birds flying in and out of twisted vines. The design is actually etched into the underlying clay and then glazed over. It is heavy restaurant grade vitrified china. Based on the impressed back stamp I estimate the age to be circa 1886 to early 1900's. However, I know nothing else about this interesting piece. Is there any other information available?