10-04-2016 08:46 PM
The dress bayonet you show isn't a Feuerwehr bayonet, it is a standard KS98 seitengewehr for Army or Luftwaffe troops. A Feuerwehr bayonet would have an "S" shaped crossguard, also referred to as a "recurved" crossguard.
The knot attached is indeed a Feuerwehr knot for lower grade personnel. I suspect it's possible a vet or collector placed it on the frog.
The frog appears brown & would be correct for Luftwaffe personnel. That said, I've purchased plenty (40-50) fire bayonets over the years that actually had brown frogs attached, in contradiction to Feuerwehr regulations which called for a black patent leather suspension frog. My suspicion is that either the frog & knot go together or the frog & bayonet with something being added at some time. Whatever the case, the rig as is, is technically incorrect.
Feuerwehr knots are always in demand & this one is in decent condition.