What an odd juxtaposition of the facts. The holster shown on Rusty's page IS a Bianchi 9R, and not a Berns-Martin; and what this means on his page (Patrick Johnakin Brown Shoe Corp. Muzzle Up Shoulder Holster) is beyond me because it is irrelevant to the creation of the Bianchi 9R; I was there.

When rating the upside down holsters (which is what the OP's title suggests) one needs to realise the the original B-M is not as secure as the final Bianchi which was the 9R2.

These styles are all easily evaluated with the 'snap test' that we used at Bianchi to gauge our prototypes after the original #9 started losing guns: empty revolver holstered, and held over a bed by the centre of the leather harness, SNAP the holster HARD towards the bed. If it stays in after two of those, you've got a winner :-).

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Red Nichols The Holstorian