This is a good resource with lots of information that may be of help in researching Japanese ceramics. Caution, it is a subscription site, with revolving payments. One can only see a limited amount of information without joining. If you have a lot of ceramics to research it may be just what you need. I do recommend using it as one reference. I always encourage researchers to do additional research to document and to verify information for any source.
https://japanese-ceramics.com/
