Due to recent purchases from eBay, I have about six B2 modules, the Keep on the Borderlands.
From the logos, I can tell 2 of them are from 1980 and 3 are from 1982.
Actually, I can narrow this down a bit.
Oh my. One of them appears to be 1st print.
Another is a second print.
Two are fourth print.
Two appear to be sixth print.
Interesting that the modules vary in height. The earliest prints are larger.
I will be keeping at least one of these (I think we can guess which that will be). Not sure if I sure sell the others, offer them as a prize or keep them, like Smaug sitting on a pile of gold.