I 100% echo what John says here. I have no problems whatsoever with any of my myriad open aged tobaccos in jars. Even 10-20 years of age I've got in mason jars for years and dip into whenever I feel the need.
I've got a large open tin of Heinrich's Golden Sliced jarred currently.
Good stuff, sharing personal experience helps inform us all. In the instance of my tobacconist, the tobacco was 30-40 years old...it tasted great the night of the smoke, a few days later it tasted like dirty disgusting old tobacco.
Yes and I have had this same experience with really old tobaccos. In fact, Darin once sent me a whole tin of 1944 George Washington Flake and after smoking one bowl that tastes like the real George Washington, it was entirely overtaken with mold the following week I still really appreciate that he sent me that jar and it stinks it was so compromised. That's the gamble we take with that much age.
"Read, every day, something no one else is reading. Think, every day, something no one else is thinking. Do, every day, something no one else would be silly enough to do. It is bad for the mind to continually be part of unanimity." -Christopher Morley
Upshall made great looking pipes. They all had really good grain. This one has great grain, all the way around the bowl. Nice birds eye on the rim. Got it from SP earlier in the year. But now, its back to that earlier cob filled with Three Friars.