I need some help identifying the uniform in the attached photo of my g-grandfather, John Wright born 29 Nov 1850 in Marnoch, Banffshire. The backside is printed with the name of the photographer "W. Sullivan, Newcastle on Tyne" who was in business at this location 1870-1871.
Was this police uniform of Newcastle police or was only the photographer from there?
I also added a close-up image. The helmet medallion appears to be 2 birds facing each other. The collar appears to be number 129 or something close to that.
Tom Wright