Way back in the early sixties, KGO radio played old radio shows as part of a series (hosted by "Claude the Magnificent" who did a piss-poor Bela Lugosi accent) called "Dreadful Mysteries".
Among the many shows presented (my absolute favorite being Orson Wells' "The Adventures of Harry Lime" which began with a pistol shot, followed by Welles intoning "that was the shot that killed Harry Lime. He died in a sewer beneath Vienna as those of you know who saw the picture "The Third Man". Yes, that was the end of Harry Lime, but it was not the beginning. Harry Lime had many lives and I can recount all of them. How do I know? Very simple, because my name is Harry Lime") was a (I believe) British produced "The Adventures of The Scarlet Pimpernel" starring Marius Goring as Sir Percy.
As far as distinctive voices are concerned, Ronald Colman has always been on of my favorites, as well as Herbert Marshall.
They both had a kind of background 'wheeze' (for want of better term).
And for good reason, both Colman and Marshall were gassed in WWI, causing minor damage to their lungs and helping to give them both a little different vocal sound. Whodathunkit?