Markus 10b. There is someone writing a book currently on Rosson. Charles Rosson was at Derby and bought a shop in Norwich which his elder son Charles Stanley Rosson ran. So you will find guns marked Derby or Norwich and some for a short period maked Derby and at Nrwich on the top rib. If you have C.Rossons then they will be from Derby; gun from Norwich will be marked C.S.Rosson. Lagopus.....