It’s based on an original often known as RCA 42 because it is rifle 42 in Shumway’s Rifles of Colonial America volume 1. Many builders have re-created it. Not an Allen Martin creation, though I’m sure any rifle he built based on this one was a dandy. The original is quite heavy and smaller caliber than we might expect.That's a profile that Allen Martin came up with if I am not mistaken, rice copied it off of his design.
She is a sturdy girl, no doubt. I have the one Martin9 built. Really nice balance.