Makes sense, considering Ralph came here to work under/with Martin/Adolph (now Martin again) in Cranbrook building Hagn rifles. Both do wonderful, amazing work, for those with the coin (and willingness) to pay for it. Ralph is more attuned to delivering fine accuracy than Martin, in my opinion. It was fun dropping into Martin's shop in seeing the difference between the two in how they worked back in those days. Watching Martin take a hatchet to a blank of exhibition grade Turkish walnut "to get rid of the excess wood" was something you'll never forget if you've ever seen it.
One difference these days is that a lot of work on custom rifles gets parted out to somebody else these days i.e. checkering, even though they can do the checkering just as good themselves. Ralf and Martin both part out work now, and I imagine most of the name custom rifle makers probably do the same for economic reasons. Martin is almost 80 now, if he hasn't turned 80 already. If you want a Martin Hagn rifle, you should probably order it sooner than later. All gun makers retire, sooner or later.
Old school vintage sheep and plains game rifles would include rifles by makers like Al Biesen, Al Linden, Maurice Ottmar, Tom Shellhammer, Bill Sukalle, Jerry Fisher, etc on Krag Jørgensen and 1903 as well as Mauser military surplus actions.
I doubt many of them were sub MOA capable rifles - in the romantic vintage era of the 50's, 60's and 70's, those guys were about stalking and taking trophy sheep and plains game hunted on foot, not long distance killing from one peak to the next that required sub MOA precision rifles for 400+ yard shots. From what I recall reading, most of them felt particularly well equipped with a rifle merely capable of one MOA.
A Swarovski or similar scope manufacturer of any flavor would not be or look old school; you may or may not care about that. The ubiquitous classic sheep rifle owned by O'Connor or one of his contemporaries probably wore a Weaver or Leupold, maybe a Redfield or Noske, or the earliest ones even a Lyman. Horror of horrors, many were only 4x magnification; how they managed to kill sheep and goats with only 4x scopes (or less) we can't imagine today.
Bluing and walnut are relatively impervious to the elements with a minimum of forethought and care; the sheep hunters of the classic era proved that for decades - the O'Connor #2 you mentioned is proof of that. Modern coatings like polyurathane for wood and cerokote and other metal finishes might be more impervious, but they certainly aren't going to look classic.
Around here, most of the locals harassing our bighorns and goats in the classic era of my youth, bought more Husqvarna and BSA featherweights than Model 70s. That would include my father and his friends, and then later my brothers and myself and our friends. Probably because as imported working mens' rifles they were less expensive than a Model 70 AND slightly lighter than the Model 70 choices off the shelf, especially after the 1964 changes that Winchester made.
Soooo... anything a custom gunmaker can do to a Model 70's metal, they can also do to a Husqvarna or BSA action. For a minimalist, sleek light action to build a rifle on, in my opinion the Husky's action (and BSA) is hands down nicer than the Winny 70 in the looks department.
This is a Husky that Bill Leeper did nothing special to other than reshaping the bolt handle to a Mannlicher style and rebarreling with a Ron Smith barrel, chambered in 30 Newton (how's that for classic cartridge?). It will put 165 grain bullets doing about 3100 fps into slightly less than a MOA out to at least 300 yards (maximum length of Bill's backyard range) every time, despite the factory stock and no other work done on it:
That's to illustrate it's classic looking, light, and accurate enough for mountain sheep hunting - or antelope hunting if you prefer - with nothing other than being a properly done re-barrel job; a custom gun maker paid to go to town on it could really turn out something light, accurate, and heirloom quality.
So you could build yet another ubiquitous Model 70 based classic sheep rifle (I suspect you're not interested in a Krag or 1903 based action just as you aren't a Mauser). Or look at one of the Husky or BSA actions from back in the early/mid 60's for your platform, or perhaps an also classic looking late 60s/early 70s Sako action like the L61 or L579 which would weigh a bit more to start with.
And if you wanted to be slightly different in the caliber department as well, the 1950s era 7x61 Sharpe & Hart was and is right at home hunting sheep and plains game. The Shultz & Larson and custom rifles I've seen in 7 x 61 Sharpe and Hart were very well done. The 284 Winchester is a 1960's cartridge that was aimed at sheep hunters as well. 140 grain bullets at 3000 fps and 160 grain bullets at around 2800 fps should be able to get your sheep and antelope hunting done.
Of course, you could browse through Jack O'Connor's Outdoor Life columns from the 60's to his retirement in the 70's and his books and see lots of pictures and writings on what the state of the art classic sheep rifle was during those years. His often wrote about about mountain rifles weighing in at 8 lbs flat complete with scope and mounts if I recall correctly -a weight many modern sheep rifles can easily best, and an off the rack Husqvarna or BSA featherweight from the 1960s that Joe Average could afford can best as well, mounted with a Leupold or Weaver scope.
A Hagn based single shot with case hardening in the caliber of your choice with primo Circassian walnut stock by either Hagn or Martini would give you a really light rifle with more barrel length to get velocity out of at the same time (several of the Hagn/Martini rifles I saw in 30/06 had 25" barrels and weighed in at 6 lbs, and felt beautifully balanced). Beautiful as they are, when I think classic mountain rifle, I'm firmly stuck on a light bolt action rifle on a receiver with classic lines, all walnut and blued steel.
You can go in a dozen different directions other than another ubiquitous Model 70 (if you so wish); beauty is in the eye of the sheep hunter... Retail therapy at its finest!
At my age my sheep and goat hunting days are numbered. I can't use my rifle as my excuse: that Husky above (that I bought new circa 1972 or so) that Bill rebarrelled to 30 Newton weighs less than O'Connor's sheep rifle by over a pound, despite the longer barrel he left on it. My legs just aren't what they used to be. No more of that start at the bottom of the mountain in the dark and be up near the top at first light...