Hopton Haynes entered the Royal Mint as a clerk in 1687, and moved into the Comptrollers office for the great recoinage, 1696. He was successively Weigher and Teller, 1701, and the King's Assay Master, 1749. He was also a unitarian writer. Publications: A brief enquiry relating to the right of His Majesty's Royal Chapel, and the privilege of his servants within the Tower (London, 1728); The Scripture Account of the attributes and worship of God, and of the character and offices of Jesus Christ (London, 1790).
From the guide to the Haynes, Hopton, 1700-1702, (Senate House Library, University of London)