This was a very interesting display of 'garter knives.' Prostitutes often carried these for self-defense and protecting their 'bankroll.' You can see images of three women and their arrest records contained in the display.
Here are a couple of small (but very pricey)
Schively dirks. Note the fuller on the one resting on top of the glass case.
Below is a close-up of the maker's stamp on the guard.
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