I don't if I am going to be much help. I owned a "pre64", and a after 64, and a post 72 modes 70 Win. The pre 64 06 I owned had no black on the fore stock. It had a Mauser action style on the bolt, much like the Ruger M77 mk2. The other 2 have the black on the forestock.
Many custom gunsmiths use the pre 64 in their creations. I certainly wish I had mine back.
Jim