I just got this in late Thursday night. This is one of the Mandolin Brother's custom ordered Martin D-41 Turbo models.
It was a D-41 with custom ordered 1/4" scalloped forward shift braces, a Red Spruce top 1 3/4" nut width and a Geib case. I can see why these were so popular on the UMGF years back when Mando Bros were in business still.
Here's a video I put up of it. Its a bit glitchy but the tone comes through well.
https://www.youtube.com/watch?v=v3SoUORtbbE