For me, it's a toss-up between the Case 6332 and the 6318HE (mid-'70's or earlier).
The 6332 is the predecessor of the 63032, and is IMO is much superior in a few ways: Most importantly, all the blades have half-stops, which very few stockmans do. Secondly, the nail nick on the sheepsfoot is better placed; on the 63032 the pen blade can catch on the sheepfoot's nail nick, and on the 6332 it doesn't. And of course, the quality of the older pre-'80's Cases are superior.
Like the 6332 (and 63032), the 6318HE has a pen blade in place of the typical spay blade. The older 6318HE's were made on a different frame than the later (and current) ones. Slightly smaller at 3.5" compared to 3.625", but carries much better because it's not as thick, and the bolsters taper, giving it a profile that's quite noticeably smaller and lighter, despite having the same length blades.