Della, don't take it apart! Even if you find a maker's mark on the metal base, it may very likely be from a different origin to the glass bowl.
It was common for makers of metal stands to put their fittings on both locally made & imported glass.
For example, a stand may be made in the U.S, or England but the glass may have been made in Bohemia.
So an i.d on the base may have no real bearing on the glass itself.
It is Victorian, around 1890s. Very attractive. This shaded opalescent green was particularly in vogue in the period 1890s-1900. Could likely be a Bohemian maker, but may be English, too. There was a lot of copying & overlap of popular designs. Impossible to pin down an exact maker without it being recorded in a catalogue of the time.