Faberge Desk Clock sold four times the expected price

Faberge Desk Clock sold for $123,900 four times the expected price at the Sloans and Kenyon Auctioneers and Appraisers.
What: Faberge Desk Clock, Dated 1896-1908, Yellow guilloche enamel With a silver mounting, 4 1/2 inches in diameter, Lot 1488
Where: Sloans and Kenyon Auctioneers and Appraisers Chevy Chase, Md. September Estate Auction Sept. 16, 2007
How Much: Pre-Sale Estimate: $30,000 to $50,000
Final Selling Price: $123,900
[from forbes.com]