Really, really early. (but this one is from shortly after the flame pontil mark prunt was made and introduced - it's on it!)
This is an unnamed early experimental "range" which eventually evolved into Aurene. Basically, it is partially cased and strapped Aurene, much more complex than the later Aurene.
It is also found in a Mdina turquoise shade, rather than the cobalt blue of Aurene - they were using up the last of the coloured enamels the Harrises brought back from Malta.
I can't tell from your pics if this bottle is turquoise or cobalt. Ideally, it should have a round clear glass stopper - but I bought a stopperless one from the Studio itself - they are not compulsory to complete a piece.
A great find, highly desirable stuff.