Unless it's a pre 64 model, or a family heirloom, it would be financially better to trade it off than to sink a bunch of money in it. They are common and aren't that expensive. I'm not sure any of mine have a serial number on the barrel.
In 1964, Winchester was bought out, and the new bean counters redesigned the model70 to a push feed design similar to a 700 Remington or model 10 Savage. (Think smooth bolt with no claw extractor). In the late 80's or early 90's, Winchester came out with the "Classic" action that resembled the pre 64 claw extractor action.
Sam Hoster in Gallatin would be my first thought. If the locking lugs are set back into the receiver, I believe I'd send it down the road.
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