HA HA!!! Yes, I was there at the end of March. I just showed up out of the blue without contacting ahead of time. The roll-up door was open and my friend and I shouted in there, and Hama-san showed up. Even though we simply showed up, she was happy to take us upstairs and show us around (very crowded!) - but man, what a great place!
Unfortunately, the owner was antique hunting in Osaka, so we could not meet him, but there was plenty there to look at! She indicated the shop is actually going to relocate (and that may have happened already by now), I've meant to email her and find out, and thank her once again for the tour. Prices did seem a bit high on a lot of the medals, which is my primary interest, but I did not comment on that. Some interesting firearms related items too, I could use a few miscellaneous parts for some of my Arisakas. Will have to inquire about those too.....