Besson instruments were sold in the UK from 1840-1855 by John Pask and after that from 1855 - 1858 by Louis Jullien from 1855 - 1858. Besson then opened their own London branch at 198 Euston Road London. Their instrument were stamped F.Besson with the monogramme FR from 1869 to 1885. From 1885 - 1895 the monogramme became FB . After 1895 the stamp became Besson & Co . The UK business was bought by Boosey & Hawkes in 1948 . I cannot date it accurately but as Boosey made their own hunting horns , i would assume that the one pictured dates between 1895 & 1948.