This may be overly pessimistic and not all that helpful, but even if the brand names are still in production, today’s blends will necessarily bear very little similarity to what they were decades ago. A number of tobaccos that were critical to early “classics” are either extremely rare, extremely expensive, or completely gone from the marketplace. For example, Syrian latakia used to be a staple ingredient in many classic blends; Syrian hasn’t been grown for more than a decade and seems unlikely to ever return.
It’s also important to note that a large number of once-classic blends have changed owners; many blends used to be manufactured on the English mainland—Balkan Sobranie, Three Nuns, Capstan, Dunhill’s blends—and these are now produced in Jersey (BS) and in Denmark (all of the other blends). Not only are the tobaccos handled differently than they would have been in the past, they’re different tobaccos due to what is currently available. (For example, when Dunhill blends were made by Dunhill, they featured leaf that had been aged for years; now that STG is producing those blends under the Peterson brand, that is no longer the case.)