Need help identifying manufacturer's mark on dishware

[portcity34]

Does anyone recognize thisJapan manufacturer's mark on the bottom of this mug?  

[janetpjohn_la]

Here is a link to the pottery board: https://community.ebay.com/t5/Pottery-Glass-Porcelain/bd-p/275
People will want to have a side view, which might help to ID it.
Janet

[portcity34]

Thank you! I could not figure out where to post and had seen that board before. It's a pretty convoluted place to navigate.