The 1960's 84mm Tinker
First layer after the scales have been removed. The liner here has the indentations introduced to the modern models. I think this adds to the strength of the liners in those high stress points for the main blade pivot.
Second layer after the outer liner was removed. All standard configuration with the spacer for the small blade without the key ring attachment.
Third layer is the inner liner with the small cut-out for the nail nick of the awl/reamer.
Fourth layer is the standard bottle opener, can opener and awl/reamer set. This one has the key ring attachment point integrated into the back layer spring.
Last layer is the other outer liner with indentations as well for added strength.