A collection of 15 sketches by John Constable come up for grabs at Christie's Old Master and Early British Drawings and Watercolours Sale in London on 3 July (CLICK). The sketches lay in a cupboard for 60 years and were finally brought into Christie's for a routine valuation. They're worth an estimated £50,000. Above is Constable's Sketch of the Ruins of St Botolph's Priory, Colchester, England. His magnificent oil painting The Lock (1824) will be in the same auction.