Just splitting hairs, but I think that the Winchester/USRA 70 XTR Fwts and Sporters in 6.5x55 were made in 1986, not 1984. I have a couple of the 70 XTR Fwts that are within 50 SNs of each other, G17847xx and G17846xx.
I have G17010xx, which is 1984 according to the
Winchester Firearms Manufacturing Dates by Serial Number and Year pdf.
I don't know where you found it bit you did good.
I got it from a friend who has had it for quite awhile. It is my first push-feed M70, which is something I would not normally be that interested in. I bought it because I like the caliber and it shoots quite well (I have fired it before). It has had a bit of work done; the trigger is very snappy and its bedded.
FWIW previous owner says he was told it was made up for something to do with an SCI show. I don't know any details.