Interesting hand saw that I restored recently; a 26" rip deeply stamped C. Johnson "Flag Works" Sheffield cast steel. The saw originally had split nuts but these were replaced by domed steel nuts a long time ago. These nuts were hot blued with vestiges of the finish remaining underneath, and I see a lot of saws with these replacements. The beech handle was smashed and the "sharpening" job was awful so de-scaling, sharpening and fixing the handle didn't disfigure anything. The blade is not taper ground but rings like a bell after re-tensioning. It will make a nice user. I believe that Johnson specialised in razors but was manufacturing saws around 1850.