This is an awesome thread for me to stumble upon. I bought a used LH Model 70 300 WSM S/N G3001xxx and could not for the life of me figure out why the gun had this "bastardized" CRF bolt. I went down a rabbit hole looking for answers, but I've seemed to finally find some! If I'm reading correctly, my m70 was one of the last NH production runs?
Welcome to the fire!
Your rifle was in fact made at the very end. Early 2006.
I don't know if they made the CRPF in lefty's or not, but you can simply look at the photos in the link AK provided and you'll know exactly which you have.