Born in London on 5 July 1852, he was eldest son of Arthur Henfrey, and was educated at Brighton College.
[1] Henfrey was encouraged in archæological and numismatic studies by Peter Cunningham, Joseph Bonomi the Younger, and Admiral William Henry Smyth.
[1] Henfrey died, after returning from a visit to Italy, on 31 July 1881 at Widmore Cottage, his mother's house at Bromley, Kent.
His major work was Numismata Cromwelliana, London, a full account of the coins, medals, and seals of The Protectorate.
He also contributed papers to the proceedings of British Archæological Association, especially on the medals of Oliver Cromwell, and on the coins of Bristol and Norwich.