These mysterious metal sticks turned out to be nutcrackers from the 1940s or 1950s, designed to extract nuts from their shells. Although they could be used for any type of nut, they were particularly useful for eating chestnuts.
Nutcrackers like these were often part of seafood tool sets, which included implements for cracking shellfish and picks for extracting the meat. Sometimes, they came with matching wooden bowls designed to resemble chestnuts.

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