1847-54 ALLEN & THURBER WORCESTER PEPPER BOX PISTOL: Allen & Thurber Bar Hammer Engraved Pepperbox .31 caliber 6 shot. Bar hammer marked ''Allen's Patent'', barrel marked ''Patented 1837 Cast Steel'' and ''Allen & Thurber Worcester''. Serial #244 under walnut? grips, between percussion holes and inside large oval trigger guard, grips without attaching screw so right now can be removed easily.