It’s approximately 1” x 1.5” (2cm x 3cm). It came with…:
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a bag of macadamia nuts still in their shell. The shells were pre-cracked and the tapered point is used to slip in the crack and twisted to open the the shell the rest of the way
…but I don’t believe it was purpose built for that use and leaves the little hook with the bent tab unexplained and unused.
Lemmy - What is this thing?
Could be a cheap can opener, similar to the ones used in military ration packs. It is lacking the typical fold out sharp blade so perhaps not, or it’s been adapted from that tool by cutting the blade part off. Pic of the tool below
https://cdn11.bigcommerce.com/s-guwk8/images/stencil/1280x1280/products/483/2423/06_032_Multi_Function_Opener__51094.1454447617.jpg