Thank you so much! I am afraid that that is all the information I have about him. It's a very small studio on the canal bank, looks like a tiny glass store from the outside and nothing more. The only pieces that I recall from the display on the window are a Japanese glass knife, the hilt is opaque and the blade is engraved, and a few abstract artifacts of glass that have, I believe, an African theme to them.
It is the only store that I can recall had engraved artifacts on display.
I know it's not much but it's the most I can squeeze out of my memory!