Japanese dinnerware china, backstamp appears to be in Japanese, hand painted perhaps

Full china set decorated with flowers with a bird on dinner plates and larger pieces, and delicate spirals throughout suggesting vine tendrils.  Borders on larger pieces are geometric--oblong sections filled in with geometric type designs.  The edges of the larger painted surfaces and spirals feel raised to the touch, while leaf vein demarcations and other small details feel smooth.  The size of the backstamp varies by the size of the piece--on the 16" platter it is amost 3 inches square.   Dinner plate is 10 1/4 inches.  Purchased in Japan in likely early 1960's.