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The vintage cranial trephine skull bone nickel-plated brass medical instrument was manufactured before 1930 and is a unique piece of medical history. Used for performing trepanation, a surgical procedure involving drilling a hole into the skull, this tool was essential in early medical practices. The nickel-plated brass construction of the instrument adds a touch of elegance and durability to its design, showcasing the craftsmanship of medical tools from a bygone era. Minor surface rust and corosion, fully restorable.