I have had this gun for about 8 years. I have never seen or heard of anyone having a model 670. I called Winchester and the gun was only made between 1967 and 1971 but they didnot have anymore info than that.Does anyone have one of these? What is the difference between the 670 and the model 70? It looks the same to me. What is the blue book value of this gun in "good" condition. It's a great gun and very accurate.any help would be great.