Worth a little bit if genuine: https://www.jbmilitaryantiques.com....cabbard-hangers-by-carl-eickhorn-of-solingen/
http://ww2talk.com/index.php?attachments/screenshot_20220725-181733_outlook-jpg.332473/ Real of course! It's even stamped "original"!
The Nazis, to put it casually, lent daggers of any design to anyone who could manage the Hitler salute in a halfway recognizable way - this means quite a lot were produced For some reason, these daggers are in high demand, which drives up the price. (I am, by the way, a hobby-cutler: these are mass-produced items, made in a shortage economy - so much for the grotesquely exaggerated price/performance ratio) Which in turn brings counterfeiters on the scene Pro tip: look for an experienced dealer. (Internet expertises are similarly helpful as telephone remote diagnoses from a doctor).
Bear in mind the value of the machine tools, dies, etc, for Nazi insignia and accoutrements was appreciated at the time of liberation. Many factories had a lucrative sideline in post-war production for the occupation forces. I know of one BLA/BAOR admin. officer who was involved in the business. The philosophical argument over what constitutes as 'genuine' will always cloud the market. The collapse of the Soviet block in the early 90s revealed at least on East German factory still with Nazi era dies and parts which flooded the market. Caveat emptor.
In fact, years ago we were asked at the forge if we could make such blades in Damascus steel. They would also provide us with a die for this purpose. Well, the blade itself would not be a problem, but my master blacksmith demanded an absurdly high sum as compensation for pain if he had to stamp swastikas in his blades..... Not surprisingly, the deal did not go through.
Knives like these proliferated in souvenir shops in the Spanish Costas in the 70s and 80s, where they were not nervous about Swastikas, reproduced and made in Spain. For my money it's one of those.