The following might help in trying to ID glass that is otherwise unknown. Compiled with the help from Glen's excellent article:
http://www.geocities.com/carni_glass_uk_2000/Japan.htmlThe Ryukyu VillageCombines many different workshops and is based on one of the southern islands - the Murano of Japan, perhaps?

Ryukyu -
http://www.wonder-okinawa.jp/009/english/index.html (in japanese) -
http://www.ryukyu-glass.co.jp/ (in japanese) -
http://www.ryukyu-glass.co.jp/shop/index.htmlThe last link does show various examples of the glassware produced.
Under the Ryukyu banner are the following workshops:
Edo
Maeda Glass Factory
Okuhara Glass Factory
Machinato Glass Factory
Ryukyu Glass Factory
Kokusai Glass Craft, Inc.
Oyafuso Folk Craft Glass
Okinawa Kotobuki Glass Craft Inc.
Giyaman Kan
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Other factories:Toyo Sasaki Glass -
www.toyo.sasaki.co.jp/e/Hoya -
http://www.hoyacrystal.jpHario -
http://www.harioglass.com/Kagami -
http://www.kagami.jp/Toyo Sasaki -
http://www.toyo.sasaki.co.jp/e/index.htmSoga Glass -
http://www.sogaglass.co.jp/en/Probably not complete, but can always be added to.