i purchased a couple of bottles (full) of vintage bourbon today at an estate sale. one of them has a legible date on the seal (1937, I.W. Harper - any good?), but the other has a broken seal, though an intact cork, and the remainder of the seal is too dirty or worn to read. it is a bottle of old taylor, 100 proof, 4/5 quart bottle so before 1979. the label is pretty worn but still perfectly legible. are there any other clues as to the age i can look for?