There are, of course, TWO B-M holsters; arguably the most famous is the upside down shoulder holster called the 'Lightnin' or 'Triple Draw' depending on how it was configured (the latter could be worn on the belt, too). Attempts to replicate this design are the ones with the elastic across the front. Originals use a wireform spring (music wire) and to copy it literally would require the mouth of the holster to be hand-stitched vs by machine. The Bianchi 9R holsters were an effort, some would say quite successful, to turn that concept into a mass-producible holster with only machine stitching. Why isn't this one made any more, since the turn of the century? One would have to ask the Bianchi folks but it doesn't seem they are any more than a brand of Safariland now, making 'stuff' vs gunleather.
The Speed holster simply may not have a market. That is, it was developed as a way to carry long-barreled, target-sighted revolves up high out of the snow when hunting. It would still do that! The difficulty is the spring: unlike a wireform, which can be shaped and even 'normalized' in one's home oven, a leaf spring like a Speed holster's requires expensive materials and expensive heat treating -- and lots of rejects in that final process.
Add to that, the risk of kicking the revolver out by its grip, when the elbow strikes it, if the spring is not really stout -- and one realizes why it is not up to modern-day expectations.
Now. One could make it with a wireform spring to replace the leaf spring! That would even allow the pocket around the trigger guard to be machine stitched. Which leaves that troublesome muzzle plug that is not only an assembly of its own but also is hand stitched. I'm confident it could be solved
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