google isn't much help except that Benjamin is noted in several art auctions as fl.1851-1869)
in another entry re heads of households Thrawl Street: Males born 1839 to 1849

Benjamin Callow Phoebe abt 1845 Bethnal Green Head Spitalfields, London ;

and in a google copied book - The monumental inscriptions in the old churchyard of St. Mary, Newington
173. Sacred / to the memory of / Henry Joseph
Benjamin Callow / who departed this life / June the
25'** 1816 / aged 41 years.