[Is it a pre 64 feed ?] - Nope.
There were no pre-64 "XTR's", for one thing - nor letter-prefixed serial numbers AFAIK.
It sounds like you have a USRA (US Repeating Arms) Model 70, made after 1982, and probably 1984-85, IMHO.
I can't recall just when the CRF (controlled round feed/claw extractor) actions were re-introduced, but IIRC it may have been around 1991 - is your bolt a push-feed or a CRF ?
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