An Ideal tong-type bullet sizer, but one that's unlike any others I've seen, unlike any of the illustrations in the Ideal handbooks, and neither shown nor mentioned in John Barlow's patent No.464311 of December 1, 1891. Notice the two pins between the sizing die and the hinge... the ends are finished on an angle such that the opposite handle contacts them both when the handles are fully closed. I don't know if this is "as manufactured" or perhaps a modification performed sometime after, but it is extremely well done and the overall finish on everything matches.
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Jim