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The illustrated soft-paste, hand-painted pot pourri depicts Longwood, Napoleon’s house on St Helena, and the image is copied from an Ackermann print of 1817.

Experts at the V&A and other specialist museums have so far ruled out as origins: Swansea, Nantgarw, Spode, Minton, Worcester (Flight, Barr, Grainger, Chamberlain) and Bloor Derby.

There has been a suggestion that it might be a product of a lesser-known Staffordshire factory, and that it might have been sent out for decoration.

Does anyone have any ideas?

Simon Butt