I traded for a Remington model 660 in 308 winchester caliber this week, I have not seen a model 660 before. The rifle is in excellent condition and has an older weaver scope on it. Can anyone tell me approx. how old this rifle is? I have about $550 in it, What is the approx. value of this gun? Condition is Very Good to Excellent. Thank You for any help you can give me.