A New Zealand art expert has attributed this unsigned painting to Group of Seven artist Lawren Harris.A New Zealand art expert has attributed this unsigned painting to Group of Seven artist Lawren Harris. (Fine Art Society New Zealand)

A painting bought at a rummage sale for $4 Cdn and attributed to Group of Seven artist Lawren Harris has sold at auction in New Zealand for $40,000 Cdn.

Aesthete Gallery says the unsigned oil-on-canvas went to a phone bidder from Wellington, New Zealand, at Monday's auction.

The piece, entitled River Scene, was estimated to sell for about $16,000 to $39,000 Cdn at the auction in Hamilton, New Zealand.

The gallery says there were "four serious contenders" bidding on the piece at auction, and they're not sure whether the buyer will keep the painting in New Zealand.

Measuring 23 by 29 centimetres, the work depicts water, rocks, shrubs and trees in shades of green, brown, blue and orange.

On the back is a label indicating it was framed in 1941 at Stedman's Book Store in Harris's hometown of Brantford, Ont.

The woman who purchased the work at the rummage sale in New Zealand's Northland region said it came from the estate of an Ontario woman who received it as a wedding gift from a wealthy relation.