Ok that early type care papers did not have numbers. Buck added the USA to it's stamp in 67-71. They moved production into that building at 6588 Federal Blvd, E. San Diego in 1964. The red Spacers you mention in the finger guard and pommel were of a very red hard fiber and used from mid 62 to 69. In 1969 they were changed to micarta of a dark maroon color. When, Buck had those papers printed they would use them until all were gone which could take years. Plus, Buck changed the handle material of the 106 to black micarta around late 1970 or 71. Still, if all is as you describe for this model, I think it's a 1967 or 68 manufactoring and has 440C steel. These are hard to find. For a small fee Buck would restore it to like new condition. Buck Knives, 660 S. Lochsa Street, Post Falls, ID. 83854 DM