Rare Whalebone Frame Saw, circa 1860, American, mid-nineteenth century. The saw is comprised of a pair of vertical arms with a cross stretcher which is mortised into each arm. At the top of each arm is a twisted rope which connects the arms. At the center of the rope is a whalebone tension bar. The bottom of the arms are rounded and the metal saw blade is attached at either end. 10 1/4" x 11 1/8". The tension bar and the rope are replacements.