Topgun;
I highly suspect your thought of using up all remaining stock had a lot to do with these atypical DS grades. Its always easier to sell an item with some up-graded parts than with some down graded parts.
Lefevers with Chain damascus bbls are most often encountered in an E grade. I do have an F grade with them & have heard of a few others. Can't recall that I have ever heard of a G with chain bbbls, these most commonly have a two-iron bbl.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra