Hi I have a very unusual bottle / vase which looks more like ceramic than glass because of its very unusual texture - it looks as though it has been kiln-fired with a 'lava' glaze or with some sort of ash in the glaze. It has a sticker underneath which says 'Mouthblown Glass'. Looking inside, one can see that it is glass. I have never seen anything like it. It stands 21 cm (8.25") high and is obviously mould blown. It's most attractive! Does anyone know the what /where/ how etc of this piece?