Over the past 6 weeks I've been fortunate to find three exceptional early Henry Disston back saws in superb early condition. These included a Henry Disston & Son 10” backsaw with closed handle (Item S4 above ), a Henry & Charles Disston 12” backsaw with closed handle (only the second example known), and this one, another Henry Disston & Son 10” back saw, but with the rare open handle. Marked Henry Disston open handle back saws are rare indeed. Erik Van Sneidern pictures one on his “Distonnian” website and mentions couple of others. This example is marked “Henry Disston & Son” on the spine and the medallion. The saw dates from no later than 1871 when the “& Sons” mark came into being, and no earlier than 1865 when Henry's eldest son, Hamilton returned from service in the Civil War and was made a partner in his father's company. This saw is in wonderful “as found” condition with the 10” blade having little “tilt” to it 2 1/4” under the spine at the heel and 1 1/16” of depth at the toe. The plate is 22 thousandths thick. It is filed rip, 15 ppi and is decently sharp. The blade is dead straight, and while lightly tarnished, has almost no pitting. The spine is marked with the inchworm “Henry Disston & Son” stamp. The apple handle is dark with age and use, but has no cracks or chips, and little wear. Although the rare open handle style, it is clearly original to the saw. The two split nut saw screws include an “H. Disston & Son” sunken medallion with the Keystone mark (not the 1865 Eagle one). The saw has been lightly cleaned.. It is a rare, collectible open handle example and was likely a special order one. Fine.