Think I got it figured out:
The only way to tell is the serial number and butt pad.
So I got the last of the post 64-pre USRAC Featherweights.
USRAC (United States Repeating Arms Corp.) was formed and continued manufacturing Winchester brand rifles and shotguns under license from Olin Corp. on 7-20-1981. This final year of Olin production saw a new "XTR Featherweight". But very few actually made it to the dealers shelves before USRAC took over.
The only way to tell is the serial number and butt pad.
So I got the last of the post 64-pre USRAC Featherweights.