LONDON.- An immensely important, rare and charming porcelain head, made in the Chelsea porcelain factory, is the highlight of the next British Pottery & Porcelain auction on April 18th at Bonhams, 101 New Bond Street, London. Fergus Gambon, Department Director of British Ceramics at Bonhams, was moved to tears by his first sight of the work, and its significance cannot be underestimated. He comments, My heart stopped. I knew that the only known example of the model was in The Ashmolean Museum in Oxford, regarded as a jewel in the crown of the ceramics collection there. No other example was recorded. Yet here was another…. and somehow even better. I was immediately struck by its radiance and beauty. Fergus continues, In contrast to the coloured example at Oxford, the Bonhams head has been left in the white as the potter intended. The unknown childs smiling face and thick, curly hair are beautifully