1940’s drama/horror

this is an old black and white film I’ve seen a few minutes of about 30 years ago when on the commercial break from the Cosby Show, not necessarily noir, but it was at least a drama, perhaps even a horror, I’d say 1940’s and it’s main thing was a dagger that was flying like it was held by an invisible man , fast or slow, and possibly killing people although i do not remember that specifically, what i do seem to remember was that it may have had a will of it’s own

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