"If you do want a very good Kyffin Williams landscape in this sale, you might be paying up to £20,000 or £30,000 for an example", Bonhams auctioneer Jeff Muse tells our Correspondent Carl Edwards.
"It is a lot of money, but I think what you get for your money is you get an iconic Welsh name, you get a work that will hopefully live with you for many years."
More top news
Helen Plint has the latest forecast for Wales.
The Labour conference has voted to give the Welsh party more autonomy, despite opposition from supporters of Jeremy Corbyn.
Matthew Barzun says he like to visit places outside London, including Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch