My $0.02: Brooks makes saddles with the same design, construction, and attention to detail as they did WBITD. They truly do still make'm like they used to. Unfortunately, modern farming techniques don't make cows the way they used to. In all seriousness, these days, they're maximizing meat production, so cattle achieve full size without their hides maturing and thickening properly. This hasn't effected the fashion industry much, as the softer/thinner leather is easier to work with and durability isn't a key factor. However, things like saddles and work boots have suffered as a result.
Brooks makes a "Select" series of saddles, from the hides of grass-fed, organic, Scandinavian cattle. They make a Select version of several of their popular models, and so far they've all been in a natural light tan color. B/c these cattle are raised old school, the leather is thicker and the experience and longevity is more akin to the old-school saddles. These saddles come at a premium price. More budget-conscious riders should check out the Team Pro model, which was always cut from the thickest section of the hide, but comes in a skinnier profile only. The Team Pros of today can't match the durability of the old Team Pros, but it's still the thickest-hided model of standard Brooks.
If you'e going for a vintage look, you can't beat a vintage saddle, and i'd say go for something old. But, if you're looking for the max mileage, comfort, and durability for a rider, i'd avoid the older saddles, as they're likely to be cracked, worn, and/or neglected, plus they've been "broken in" by someone else's butt, so comfort won't be maxed out. The best part about riding a suspended leather saddle is that it will break-in, and in so doing, it will conform to the rider and offer a truly excellent ride. I've been riding late-model standard Brooks saddles, and i've been getting years of service out of them, although i do find that the newer ones twist and flare more than the old ones did....
I just bought one of RRB member
ifitsfreeitsforme's leather saddles; it hasn't arrived yet, but i'll do up a full review once I get it and start riding it. Should be fun....