Japanese I am sure, otherwise no surety at all!

I picked this up in Sydney recently at a garage sale, filthy but with promise.

I am certain it is Japanese. That shape, the three points rim, the colours, the clear casing. I still don't know who made it however.

I think possibly Sanyu because of the tool marks and the way they have worked the clear ribs, but this colour mix is not one I have seen from them before.

Any ideas guys?

Tallish at 32cms