PAT 17647 INOX 19cm Spanish OTF DA Vintage 1970s automatic knife

Vintage PAT 17647 INOX 19cm Spanish OTF DA automatic knife most likely made in Spain in the 1970s or 80s. The knife measures 18.7cm (7 3/8 inches) open and 4 3/16 inches closed with aluminum frame & button (switch). The flat grind spear point blade is 100% full with all of the original finish intact with a few faint scratches and the ricasso is stamped PAT 17647 INOX (number is a little hard to be sure, but we think it's right). The black plastic covers are in very good condition with a tiny dimple and some very light handling marks. The knife works well with blade opening fully and locking when the button (knob/switch) is pushed forward and fully retracts into the frame when pulled backward. EX condition.