"Henry Bone RA (6 February 1755 – 17 December 1834) was an English enamel painter who was officially employed in that capacity by three successive monarchs, ...
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George III, George IV and William IV. In his early career he worked as a porcelain and jewelry painter. He was elected a Royal Academician and produced the largest enamel paintings ever seen up to that time." - (en.wikipedia.org 27.11.2021)