Not many of these out there, so I guess I should take this and reply.
The holster you saw was a prototype and I never got beyond that. It was 5" wide, and it is a little wide, the one I carry is 4 1/4" wide, which is about right. But it can be more, or less, I leave that to the user to decide..
The holster is still in the hands of my "field tester", maybe he will chime in soon...
It is a very comfortable holster..