Thank you Benuser and Dave Martell! It seems my knife was made sometime between 1920 and 1941! I took it to work today and made a radiography of it (see enclosed image). Like Benuser said, the tang is very thin and one can clearly see empty space between the (rather crooked) tang and the wall of the bore through the handle. It appears that the part of the tang that goes through the ferrule has been machined on a lathe.
BTW, your link doesn't work.