by Guy Adams 
When is a Banksy not a Banksy?
That is the million, or rather $450,000 question  facing bonus-fuelled New York collectors who are beating a path to a  new, and unsanctioned, exhibition of work by the world's most famous  street artist. 
The Keszler Gallery in the  Hamptons, Wall Street's favourite holiday destination, is facing stern  criticism from Banksy representatives and his fans after attempting to  sell two high-profile works of public art, which were originally  intended to brighten up the streets of Bethlehem. 
The pieces, referred to as Stop & Search and  Wet Dog, were stencilled on to prominent walls in the West Bank city  during a visit by the British artist in 2007. They disappeared shortly  afterwards, only to re-emerge at the Keszler Gallery in Southampton  Village late last month.
News of the sale has  angered Banksy enthusiasts, who argue that the works were meant for  public consumption. They argue that street art is meaningless – and  therefore value-less – outside of its original context, and say that  foreign art dealers had no right to participate in their removal.
The  gallery takes an opposing view. It insists that the pieces, among seven  large Banksy works in its new show, were legitimately purchased and  exported from the Palestinian territory. If left unprotected in their  original location, they were in severe danger of deteriorating, and by  now would almost certainly have been vandalised. 
Fuelling  the controversy is Pest Control, an organisation that is the nearest  thing the reclusive British artist has to official representation. In a  statement to Artnet magazine, it claimed that only one of the six pieces  in the Keszler show had been formally authenticated as Banksy's work,  and admonished the gallery for removing them from their original  setting. 
"We have warned Mr Keszler [the  gallery's owner] of the serious implications of selling unauthenticated  works, but he seems to not care," read their statement. "We have no  doubt that these works will come back to haunt Mr Keszler." 
The  debate highlights the problems that emerge when the soaring  contemporary art market turns what some view as petty vandalism into a  prized commodity. These days, Banksy pieces can fetch as much as $1.9m,  meaning that his public works are often thought to be worth more than  the building they originally graced. 

 
