it looks similar to what I've seen on many of inexpensive folding knives, and they usually come with a small tool that fits them and doesn't seem to match any other "real" tool out there.
I've had luck on similar spanners with small, pointy tweezers or extremely fine needle nose pliers if the screw isn't gorilla tight. You can sometimes also use a small flathead as a chisel in one of the openings and just tap it in a counter clockwise direction to break it free.
Take a cheap flathead screwdriver, I'd put it in a vise or clamp it, mark how wide you need your spanner teeth, throw a cutoff wheel in your grinder and notch the middle
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