George III blue john vase, £6500 at Kinghams.

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The Buxton Museum confirmed that the vase was made with fluorspar mined in the late 18th century from the Winnats One vein in the Treak Cliff cavern – the preferred choice of Boulton who once tried to buy the mines to guarantee a good supply.

Combined with a typical base of black marble from Ashford and the skills of Richard Brown & Sons who did much of the marble work at Kedleston Hall, it is very much a Derbyshire piece.

Offered for sale in Moreton-in-Marsh by Kinghams (23% buyer’s premium) on March 10, it took £6500 (estimate £1500-2500).

Owen work

The spring offering in the Cotswolds was led by a collection of Royal Worcester wares including a group of gilt and reticulated pieces by George Owen.

Leading proceedings at £10,000 was a 4½in (11cm) spherical vase with loop handles and bracket feet (model 1257) from 1909 while a 7in (18cm) bottle vase and cover (model 151) with the date code for 1913 took £9000. Both pieces carried incised signatures for Owen.