I have a letter from the distillery from the mid 1980's in reply to my question about the difference between Black Label and Green Label.
The reply was that there were three differences, age, proof and price.
The Green is aged slightly less, producing a slightly less mature whiskey. At the time, Green was lower proof (86 proof compared to 90 proof for BL) and price. The GL is still slightly cheaper than the BL.
Since the lowering of the proof, there is no longer a difference in proof. I assume the GL is still less mature, as it appears a little lighter in the bottle than does the BL.
GL predates BL, there have been a few recent 1904 bottles of GL, full and sealed, that have sold. The older GL was bottled at 90 proof, interestingly.
There has never been a blue label Jack Daniels spirit. Johnnie Walker Blue Label is their premium 25 year old scotch.
The Tennessee Squire Associate was formed by Winton E Smith, then the company's first marketing director in 1956. There is a square inch of land in unmarked plots in the Squire Field at the Distillery.
I was at the Distillery in Building #4 this past weekend (the Single Barrel tasting room) and the sample bottles had yellow forms taped to otherwise unlabeled bottles, hand numbered by barrel number, rick number etc.
Lem Motlow Whiskey was only available in Tennessee and was only aged 1 year. They stopped making it in the mid 1980's.