Toyo Ikebana typically has a sticker to identify their pieces but this piece has no sticker however all of the research I've done points to it being a Toyo Ikebana piece.
The only difference I see is this one has a fully glazed base. 
Beautiful mid-century modern abstract free-form ceramic ikebana vase in gorgeous vintage condition. 
Japan circa mid 20th century! 
Wonderful black gloss glaze finished over beautiful curved form!
The vase is in beautiful vintage condition showing only the slightest signs of age with no chips, cracks, damage, or issues of concern and retains a nice clean interior. 
As can be seen in the images the vase displays beautifully
7'' wide 8'' tall.