1884 Webley & Brain patent. The action has a threaded spindle and a doll's head, a cross shaped doll's head or a simple step as a rib extension. the top lever bolts the step on the extension, providing a third grip (as well as the Purdey double under-bolt). Use by a huge number of gunmakers., usually built for the Trade by Webley/ & Scott. You will see it used extensively on double rifles by Army & Navy, Rigby, Atkin, Tolley etc and very commonly on boxlocks by William Evans, Army & Navy, and many others. It is a very good action, often made in very good quality. It is trickier to re-joint than actions without third bites. Look out for gaps at the top forward edge of the doll's head.