I agree re the gilding

However interestingly Bonhams do not definitely identify it except to say 'Bohemian' and it was only sold 4 months ago.
I can see that the Russian piece I linked to is different to yours however the rim is similar and also that it is ribbed. There are a few lilac opaline pieces in the Hermitage collection and some are also ribbed like your piece. One is a lidded trinket box, one is another perfume bottle and the other is a small vase as I recall. All have some ribs in like yours if I recall correctly.
I am going to have another quick look as I recall also seeing a becher, cut, opaline, in a pale blue and white like the middle piece on the Bonhams site, I think also enamelled and also Russian glass. edited to add - no, I checked again and it's not the same.
And also to add, that maybe Bonhams didn't identify it firmly because previous pieces have only been identified as 'probably Buquoy'... and as Mike says, it is known that Harrach did make similar?
m