Graff Was Probably Not a New Zealand Glass Artist

I have recently purchased on New Zealand auction website TradeMe a piece of glass signed graff 73.  It is 14 cms high.

I am pretty confident this is not a piece of New Zealand glass, but most likely a work by one of the early studio glass artists in the United States. 

The Live Auctioneers website http://www.liveauctioneers.com/item/772794 shows a piece of Graff Studio art glass sold at auction by Richard Hatch Auctions of Flat Rock, North Carolina on 18 February 2005.

Maybe Mr (or Ms) Graff made only a few pieces of glass, since he (or she) doesn't seem to have left much of a trace in the glass art world.  But if you know anything about Graff Studio Glass, or have any examples, I would be very interested to hear from you.