Hi Spock,
I'm no expert on these but I have a couple of concerns. The HJ bayonet, issued to members of the Wachgefolgschaft ("Watch Followers" I believe) are quite rare and must all be looked at with scrutiny. First off, I'm fairly sure period pieces were only with the 20 cm blade and yours appears to be a long model with a 25 cm blade.
Secondly, the real touchstone on these pieces is, of course, the emblem. It must be pinned from the inside prior to the bakelite grip plates being riveted to the hilt. If properly pinned, the emblem will have a slight "wiggle" to the touch. You've said this one doesn't have it which is necessarily dispositive but usually a bad sign. There's no way to check this other than to have the item X-rayed. But let's look to the emblem's appearance itself. The emblem appears slightly off center between the rivets, just a bit too high. Also, the checkering of the bakelite appears to be somewhat skewed. Not terrible like a lot that I've seen but still slightly buggered.
Also, particularly on the right side, there appears to be some epoxy or something between the emblem and the bakelite. I don't know, that's the way it appears from the pics.
On a lot of these, the rivets are skewed and the grip plates have been replaced, that doesn't appear to be the case here. I would say the piece appears to me to be an original K98 dress bayonet with original grip plates with a postwar added HJ emblem. Sorry, just my thoughts from the pics.
BTW, the HJ bayonet mentioned in an earlier post was post war as well. I remember the specific piece well as it had an odd distributor mark of CA Staehle. The piece failed to sell at the original sale because it was outted as a postwar modification.
Here's a picture of an Alcoso HJ bayonet from Eban. At the time this was on auction, I believed the piece to also be fake but who knows. Maybe someone got a deal, it sold for $250. You can see a slight space where the emblem is affixed within the grip plate. Tom Wittmann had one a year or two ago that I believed might have been period. Maker mark was Gustav Spitzer and it was priced at $1795.