The Norton Perfection is also known as a Citation - a racehorse who wore this bridle.
Used to be used mainly in the racing world.
This has like the Scorrier, four rings with the reins going on the outside ones. It also has two mouthpieces, the inside one has metal loops to which the nosepiece is attached is very thin and sharp. It produces a squeezing action on the jaw similar to a scorrier and operates in much the same way but more severely than the Rockwell.