6 letters, written between September 1964 and April 1965, from a representative of Guinness Mahon and Co. Limited in response to enquiries from Christopher Calthrop. The subject of the enquiries is never mentioned, but presumably they are connected to the question whether Dion Boucicault was ever a clerk at the Guinness Brewery in Dublin. (The Guinness Mahon bank was founded to deal with the money belonging to the Guinness brewery family.) Calthrop is referred to colleagues in Dublin and told that no information has been found. 6 letters, written between September 1964 and April 1965, from a representative of Guinness Mahon and Co. Limited in response to enquiries from Christopher Calthrop. The subject of the enquiries is never mentioned, but presumably they are connected to the question whether Dion Boucicault was ever a clerk at the Guinness Brewery in Dublin. (The Guinness Mahon bank was founded to deal with the money belonging to the Guinness brewery family.) Calthrop is referred to colleagues in Dublin and told that no information has been found. 9.1964-4.1965