UBB.threads Forums Edged Weapons Welcome - New Collectors Start Here SS Marked 84/98 bayonet

Hello, odd one just showed up. A fellow collector, knowing I collect German rifles and pistols, asked me about a K98 bayonet with no other markings other than a small deep SS (runes) marking just below the guard on the blade. All fine finish pre war rust blue, unsharpend, pointy tip, nothing ground, nothing removed. No proofs, no date, no maker on bayonet or scabbard. Very close inspection finds a number 6818 on the side on the locking stud (as I have seen before) - but that is it. it has a well used high gloss dress frog. I checked Wittmann and Johnson books plus several others - nothing (except death head one and dress etched). What throws me is no other markings? Let me know what you think.