Need help! Authentication of SS Dagger- Bertram

Found while going through late relatives treasures. I don’t know the history how it was obtained but it has likely been sitting, untouched for at least 50 years.
Any comments or tell-tale signs regarding its authenticity and value are greatly appreciated. I’ve done some research and I can see that Bertram made daggers are pretty rare.
Thanks in advance for any suggestions of tell-tale signs of fakes/authentic daggers.

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