A mockup, or casting mold, for an artificial hip? The upper part has somewhat the shape of the greater trochanter and head, the "ball" part of a human hip joint (which is a ball-and-socket joint). It's about the right size, too. Could this be a step in a toolmaker's process for making an artifical hip replacement? Maybe the lower part is just for holding it in a bench vise. But I'm just guessing.
On second thought it looks a little bit big for a human hip joint.
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-- Carl
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