For your consideration is an Obscure COOK BROTHERS Cook Bros Sheffield England MOP Pen or small Pocket Knife. This danty little antique knife has Mother Of Pearl handles, unfortunately on handle has a piece missing. The blades have signs of old pitting and stains, but don't show much use. The blades have good snap to them and no wobble. One blades is marked "COOK BROS SHEFFIELD". The knife measures about 2 1/2" inches long when closed and the largest blade measures about 1 3/8" inches long. Please review the pictures to verify the condition.