Most of Napthali Hartís work was done in partnership with Duncan Urquhart. They entered their first mark together on 18th October 1791, with several others after that. Napthali Hart entered his first mark alone on 10th April 1812 as a plate-worker. His workshop is titled Hart & Harvey from 1817 to 1827 and in 1828 he was joined by his son, John. Napthali Hart silver sugar tongs are very plain, the standard style for that period.
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