A brass Heinke diving knife with leather frog and strap with a popper. 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. 6 1/4" or 16cm non serrated single edged blade. 32cm or 12.5" total length of knife in sheath.