Check the listing for details. George Selsor 1867 Patent Double Hammer. Condition: Used. Listed at 145.00 USD. There's a normal claw and also a "pane" right below it that is similar to a claw but without the groove. This was patented on March 19, 1867. The shank of the nail rests on the top of the pane and is held in place by the head being in the groove on the bottom of the regular claw.
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