A pre 64 94 will have Winchester stamped on the tang. The later models didn't but that may have changed later.
Pre war would, but not neccesarily "pre-64". I believe they stopped the tang markings in the late 30's or so, perhaps into the 40's.
From about the mid-30's on, they looked pretty similar to the later guns. Plain shotgun butt with flat butt plate, ramp front sight, and the long wood forends stopped in the early 50's. Still finer made guns than the later ones, tho, as was pointed out, the overall quality was slipping for some time before 64.
As for looks, I still prefer the early type carbines, generally called saddle ring carbines, or eastern carbines. They faded out in the late 20's-early 30's, to become the ordinary looking guns that haven't changed much since in general apearance. Some mistakenly call later guns "eastern carbines", but its an incorrect usage of the term. The only difference between an "eastern carbine" and a "saddle ring carbine" was the lack of saddle ring. Both had the same small stud front sight, front band in front of the sight, long forend wood, early carbine type butt (flattish top with curved plate, like the 73 and 92 carbines had), and "ladder" type rear sight generally.