I recently bought a Winchester Model 70 in 300 Win. Mag. and was wanting to find the year or manufacture. I know first off, it's not a pre 64 but was just curious of the age.I've been looking all over the net and keep coming up with nothing.Also,this gun does not have a G prefix in front of the serial # ,but from what I have found it should( I think).Can anyone help? Serial # 880837. Thanks in advance, Handle02