Nice condition Rosson. I collect guns made in Derby and Derbyshire. I have a few examples made by Rosson senior in the Derby shop. Charles Stanley Rosson was his son who opened an outlet in Norwich. Other good, but seldom seen Derby guns are by Robert Lisle, Frederick Gates, John Fry and William Ellis. A trick with Rosson guns in dating them; and that applies to both the Derby and Norwich ones, is that the first two numbers of the serial number are the year date. Lagopus.....