Twelve years old would make it a -4 with the radiused hand, new rear sight (is rounded on the front towards the barrel is the easiest way to tell). Could have a square or round butt, they changed during that time.
I would estimate $450 to $550 based on location and demand. Deduct $50 off the book value at any rate for the missing target stocks if it is a square butt. My estimation would be:
Condition excellent, so my guestimate is:
Square butt with stocks: $550
Square butt w/o stocks: $500
Round butt w/hogues: $450 to $500.