Auction information for the chosen item by Bridget Riley

Artist	Bridget Riley (1931 - 1984) England
Title	Study, Warm And Cold Greys, Segmented Curves
Medium	Pencil and gouache on paper
Size (H x W x D)	11.7 x 10.9 in / 29.7 x 27.7 cm
Signed	Yes
Stamped	No
Inscribed	No
Dating	N/A
Lot number	209
Auction time	20 October 2008
Auction house	Sothebys – United Kingdom: London, Bond Street
Estimated price	35,000 - 45,000 GBP
Auction result	51,650 GBP ≈ 57,244 EUR \| 84,630 USD
With premium	Yes
Edition	N/A
Foundry	N/A
Impression	N/A