Antique slave wooden 1800's shackles restraints New Ulm

Nice very old pair of wooden shackles. bought at estate auction, Have no way of proving this, but i was told that these were used by the locals of New Ulm Mn. for leg shackles after the Sioux Uprising of Aug of 1862 but I have No proff of that, they have some glue on them which could be removed. but otherwise they are great cond.