If it actually falls into that 1969 manufacture year, that makes it a Viet Nam era Mark II.
That gives it very much added value, if it's in good condition.
If you can prove Viet Nam carry/service, ie a service member's name on the back of the sheath, etc, the value sky-rockets.
If used or carried by a Seal, Force Recon or Special Forces, or LLRP, the value is out the roof.
We need to see good quality scans or photos.
DE OPPRESSO LIBER
"...Men may spurn our appeals, reject our message, oppose our arguments, despise our persons ___but they are helpless against our prayers. "