A very similar regulator by Matthew Dutton was sold Sotheby's, London, March 7, 1996, Lot 325 for £73,000
Another, signed Thos Mudge and William Dutton, was sold Phillips, London, June 11, 1996, Lot 280 for £48,000
William Dutton Bc. 1720-1794 was apprentice (1738-1746) to the great MAster George Graham d.1751. Very soon afterwards in 1755 Dutton went into partnership with another great Master, Thomas Mudge 1715-1794. Together they produced some of the most elegant and technically advanced clocks of the period. The partnership ended in 1771 and the present regulator was probably made circa 1775, or certainly before he took on his son, Matthew, in 1779.