Four square tobacco is good, at least the little bit I have had. I have an open tin of Four Square Mild Navy Cut. It smells and tastes like fresh bread out of the oven. Yummy.
I also have squirreled away, a tin of Four Square Ready Rubbed Flake, and a tin of Four Square Curlies. According to the gentleman I got them from, both unopened tins are approximately 30 yrs old.. He states that he purchased them from an friend 15 years ago, and that they were approx 15 yrs old then. All I know is that I am saving the unopened tins for a very special occasion. The Mild Navy cut was unopened, but the seal had broken. I had to rehydrate before enjoying. It is amazing for sure.