Blue Willow China

Two Blue Willow China plates. The plates are not exactly the same, the images have some slight differences. The larger plate is just under 7 1/2 inches across, on the back the only mark I could find was a image of a small blue arrow. There’s a lot of brown staining. The smaller plate is six inches across. On the back there is a small blue mark, not sure of the image but I see two small dots and a possible x or cross partially encircled. Their is also a staining on the reverse. This plate also has slight indentations going around the edge of the plate, I counted 8. Hopefully you can see it on the image. I don’t collect Blue Willow China, but I liked these plates and I hope someone can tell me about the age what those marks mean. Thanks for looking.