35559258© Licensed to London News Pictures. 27/10/2011. London, UK. Andrew McKenzie, Director of Old Masters talks about the painting. A previously unknown portrait by the Spanish artist Diego Rodriguez de Silva y Velazquez (1599-1660) is unveiled at Bonhams Auction House in London today, 27th October. The work is a portrait of a gentleman in a black tunic and white collar and is expected to fetch 2-3million GBP.  Photo: Stephen Simpson/LNP
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