Just picked this up locally tonight. It is 13/16 and the only bit of big rust is the spot near the heel visible in the photo. The down side is the backside scale is cracked in half at the pivot. No worries, I think I have just the bone scales to fit it courtesy of Shaun. It might be tight on the length but should work. It looks to like the Boker tree trade mark is from the 1869 - 1900 period. Finger crossed that it will clean up, hone up and fit the scales I have in mind. Not a bargain considering the cracked scales but worth it, I think for the blade.
Bob
Edit to add
The trade maker stamp tree might also be from the 1920-30 period. Damn trees confusing to a old feller.
http://i59.photobucket.com/albums/g2...pskamkjdkj.jpg
http://i59.photobucket.com/albums/g2...psp2vb963y.jpg