Hi Puzzler - thanks for the welcome!
Yes that would be me. It's still in its infancy, but growing steadily as I work through stock new and old.
You're right, there is a lot to learn about the pre-1900 Japan stamps - lots of different papers, rife with forgeries and high price tags to deal with. I'm saving those for a rainy day myself. Even some of the later definitives in the 1900's and 30's and 40's can be a little complicated, but the process of discovery is part of the fun, at least for me. You know, I tried to catalog some early US issues I have and that made
my head spin.

Hope to see you again soon!