Koizumi Glass's products were added. Koizumi Glass was founded in Tokyo in 1912. Products are made by hand blowing.
https://www.shokunin.com/en/koizumi/shiyaku.html (Shiyakubin)
https://www.shokunin.com/en/koizumi/canister.html (Canister)
https://www.shokunin.com/en/koizumi/schale.html (Schale)
https://www.youtube.com/embed/e_9LwV3qLFA (Craftsman's Video)