Third Model with standard "TOWER" and crown over "GR" markings on the lock plate as well as a British proof and a small "R&RS". "Crown/GP/V" and "crown/crossed scepter" proof marks on the left side rear of the barrel and "crown/21" on the right. The front sight has been ground off and there are no provisions for a rear sight. All parts appear to have been finished bright. Brass mountings and mounted with a full straight grip walnut stock with brass forend cap, tear drop flats and iron ramrod secured by three brass pipes. The left side plate and top of the stock ahead of the buttplate tang are stamped "131", and the left flat is stamped "MN".