This object is currently on display untill the 13th, in the Sainsbury centre for the Visual Arts at the University of East Anglia.  It is a rather special exhibition of pieces from many museums. I was lucky to be able to visit while I was on holiday in Norfolk.  Only a couple of days left, never mind you can always get the catalogue.  The exhibition is called Pacific Encounters, art and divinity in Polynesia 1760-1860. send them an email. 
