I'm not sure what you mean by free form. If you mean is it unique, probably not. It will have been made by hand in a factory or a studio to a prescribed and designed shape, as are most hot worked commercial pieces. Each piece will be ever so slightly different to the others in the range, but only under very very close scrutiny. So if you mean did someone just think of a shape and then make it, no. It's unlikely a mould was used; glassworkers work very accurately by eye.