There are many dozens of named burley varieties. Some on-line vendors take the liberty to make up their own names. I'm not aware of anyone who would even know what "Original Burley" is. That particular "Original Burley" might simply be the initial, unidentified burley sold by that vendor as "Burley", then renamed when a second variety of burley was added to the inventory. CV's guess as as good as any (i.e. just a wild guess).
One matter worth noting is that most of today's burley varieties are white-stem burleys, and have pale stalks, pale central veins, pale green leaf lamina, and color-cure quite rapidly. If your "Original Burley" is lacking in the pale stalk, veins, lamina, then it may be from a group known as "red burley".
Bob