For those that may be new to the whole MAC scene, the "operational briefcase" has been around since the 1970s. They are hardly a "gimmick" or a novelty. They are some of the most desirable and collectible pieces, when original. They were originally and primarily designed to be used with a suppressed M11/.380, but some models were made for the M10 and a unique shortened suppressor. That rarer version appears to be the one referenced by Slomo and for sale with an M10/9 at Practical. It was manufactured by RPB in the late 70s and redone in the early 80s. The one in the Novaguner posted video appears to be one of those styles also, but the more common M11 version.
The one I posted about is nothing like anything I've ever seen, hence the "Bubba" comment from long time and knowledgeable poster Gaujo.
I'd def be interested in seeing the listing where one sold on GB recently? I must have missed it.
As an aside, I own one of the first original cases, made at the Werbell compound in PS early on.