Hi Julie, this reminds me very much of the 'glacier' pattern from Hoya Crystal, and when I needed help in identifying a piece of glass I had that I thought might be Hoya, I posted a picture to them on email and within two days had a wonderfully informative reply telling me more than I could ever have hoped for about the piece in question.
I wrote to the person below, Yumiko Uekado by the email address given.Yumiko Uekado
Foreign Trade Section
HOYA Corporation Crystal Company
3-3-1 Musashino, Akishima-shi,
Tokyo 196-8510 JAPAN
Fax: +81-42-500-0096Email: email@example.com
It might well be worth your while writing and sending a picture of your lovely vase and if it is Hoya, you will get a lot of information about it from them.
If it isn't they will tell you, and it could be that they might even tel lyou who the maker is if they do know.
Best of luck,