thanks m...........I was really taking a bit of a flyer on the Czech. comment.........however, there was some logic in my thought, insofar as if you look through Ruth A. Forsythe's book, black is a colour that the pre 1940 Czech. factories used not infrequently for stems and feet - plus some of the external decoration. There is arguably some similarity, again with Czech. material, in the type of colour decoration of my bowl........this almost 'spatter/swirl' effect of distributing the colour thoughout the glass. However, I'm still having trouble with the fact that my piece looks a tad too clean, but suppose it might have been little used. (unfortunately there are a couple of flea bites on the rim).