Unknown man c1890 - Another excellent choice for Edmund's close friend, a detective. As a note, the facial hair (i.e. beard, no mustaches--unless they're too light for me to see) would be unusual for this era in England--possibly he's from the Continent? EDIT: Not Continental but not English, either: He's Daniel McCarthy, 1866. From the Mountjoy Prison Portraits of Irish Independence, NYPL.
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