Silent Majority, an early piece by Banksy and another Bristol,UK-based graffiti artist known as Inkie, is to auction at DIGARDAUCTION in Paris.
The lot carries an estimate of $439,000-585,000.
It's painted on the side of a trailer belonging to travellers, who are behind the consignment.
They explained: "Silent Majority was painted in 1998 at Glastonbury Festival as a Graffiti show outside the Dance Tent, done over three days.
"Banksy asked us if he could use the side of the lorry as a large blank canvas….
"The significance of Silent Majority is that it depicts this era and was painted whilst the free party movement was in its prime…Silent Majority depicts the last rave and hiphop scene of the time."
Banksy's work has proven extremely popular both with the public and collectors over recent years.
The present lot is of particular significance, as Mary McCarthy, an expert in street art, explained: "We've seen some incredible works by Banksy on the market in the last few years.
"However, I think in terms of provenance and uniqueness, this one tops them all. For me what is quite special about this piece is it's one of the few free hand pieces on the market. This one really is a rare piece."
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