Help with unidentified tool

Everlasting

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May 5, 2021
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I received this with a watchmakers lathe and was wondering if you could help me identify it. Very well made with a brass or bronze overarm and thumbscrew
and a steel base.The plunger lever activates a V" shaped wedge that compresses in to a V" shaped notch.Two small rollers. No markings.
Approximately 3-1/2" long. Any help greatly appreciated.

wat1.JPG wat2.JPG wat3.JPG wat4.JPG
 

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