I am stumped too. I found the 2001-2019 catalogs on line. I did not find this version anywhere. I got it in a trade so maybe someone else swapped it into this stock. I also could not find a CRF version of the matte rifle in those catalogs but that is what it is. Matters not though, as you say it seems to work great.
This is what I have except no boss
https://www.gunsamerica.com/998826341/Winchester-Model-70-Classic-Synthetic-Matte-Bos.htm