Lovely! It's a real education examining the vintage Rigby's. Such a range of woods and hues to the woods, yet very few examples (at least insofar as the images I have witnessed) of the really ornate woods many insist on today, despite the fact that i'd have to think such woods were much more abundant then than they are now, as per the trend with resources in general. (My own theory here is that as the people carrying firearms of all makes spent less and less of their year on average actually hunting once the golden era of more relaxed clocks and unfettered spaces combined with manageable human numbers was over, the hunter's need to occupy him/herself on their passion needed to find new areas of related focus, and logically this became the arms themselves. The demand for better wood, and for those who couldn't afford that, levels of accuracy and other ballistic details that while useful no doubt to a professional sniper and perhaps for focusing the attention away from the hideousness of a plastic stock, no one really requires on a hunt. Did Wally Johnson spend much time pondering wood grade?) The vintage examples when examined underscore just how expertly/successfully Rigby in our times has taken the old stylistic elements of the marque and distilled them into generally more handsome and perhaps more immediately recognizable-for-what-they-are designs. It's all turned out to have been very well-played.
First off, you make some excellent observations and points. If I may, I think there are a couple of additional factors at work here.
First, I don’t believe the highly figured Turkish/Circassian walnut that we associate with modern best-grade rifles was nearly as prevalent in the British trade then as it is today. English walnut was very commonly used, and much of the wood selected for sporting rifles had considerably less mineralization and dramatic figure than the Turkish blanks we tend to prize today. That’s not to say highly figured walnut didn’t exist, this is one factor, but I don’t think availability alone explains why we see relatively little of it on surviving Rigbys.
I also think the old makers were selecting wood primarily as rifle makers rather than as collectors. On a rifle intended to spend its life in Africa or India, straight grain and proper grain flow through the hand were far more important than spectacular figure. This becomes especially important with the larger cartridges,
There is another interesting mechanical consideration with the early Rigby, Holland and Jeffery rifles. Many of those rifles had relatively small grips—around 4½ inches in circumference—compared with the fuller grips generally used today. Highly figured and heavily mineralized Turkish walnut can be less forgiving in that relatively thin wrist, particularly when subjected to the recoil of a .350, .416 or the larger Nitro Express cartridges. I have a 500 Jeffery from 1928 that has a 4.5” grip, (this gun is a real thumper) and wouldn’t handle a blank with a lot of mineralization or figure. All that to say, A beautifully figured blank isn’t necessarily the strongest blank.
So I suspect what we’re seeing is partly availability, but perhaps even more a difference in priorities. Rigby was building working rifles for hunters who actually intended to carry them hard and shoot dangerous game with them. Strength, grain orientation, weight, balance and durability came before dramatic figure.
Your point about Wally Johnson is a good one. I doubt men like Johnson spent much time worrying about whether their rifle had exhibition-grade figure. The rifle was fundamentally a tool, albeit an exceptionally well-made one.
Today the rifle itself has become a much larger part of the hobby. We admire the wood, engraving, accuracy and minute details in ways that the original owner of a 1910 Rigby probably never contemplated. Modern Rigby has recognized that extremely well. They have retained the unmistakable proportions and styling cues of the old rifles while refining and emphasizing them for a modern customer who appreciates the rifle as an object in its own right.
In some respects, the old rifles may actually tell us more about what Rigby considered important: not necessarily the prettiest piece of walnut, but the right piece of walnut for the rifle.