A brass Heinke diving knife with leather frog in brass scabbard. Stamped to the handle 'C.E.HEINKE & CO.LTD.LONDON' and to the top of the sheath 'HEINKE LONDON'. With internal spring to hold the knife in place. The 6 1/4" double edge blade, serrated to one side. 12 3/4" or  32.5cm total length in sheath.