Photo #1 ~ 9: A crane is depicted on the background of two piece of Origami (paper). Very interesting and creative design. The two deformed characters are embossed around the edge. They looks like in Japanese (武 & 是). One could mean "Samurai". These features are unique to 1655 ~ 1670s Ko-Imari plates.
Photo #11 ~ 12: At the back of the plate, a deformed character in Japanese (福) was drawn, which means prosperity. And morning glory is drawn around the edge. The combination of these two features is an additional proof point that this plate was made during 1655 ~ 1670s.
Photo #13: Several imperfections (e.g., small or pin holes, black dots) are observed. They are rather good proof points that the plate was made during 1655 ~ 1670s. This came from the nature of the materials (e.g., cray) and techniques used to make this plate in those days.
Photo #16 ~ 17: The plate is stored in the high-quality paulownia wooden box, which is believed best to keep precious antiques for long time.
Should you have any questions, please feel free to contact me.