Vintage Hammer Brand Switchblade Automatic Knife

What type of Knife is this? It was with my grandpas stuff, no idea where its from. : r/knives

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Vintage Hammer Brand Switchblade Knife

Huge Automatic Knife Stiletto Switchblade 15

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Sold at Auction: Vintage Hammer Brand Switchblade Automatic Knife

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Hammer Brand Knife for sale