Sigma/Martin DM-5 - similar to which Martin?

[HockeyDude]

So I finally have my son's Sigma/Martin DM-5, and had that saddle and nut replaced with bone, the action lowered and the strings replaced.

I know that the DM-5 isn't a "real" Martin, but is styled and constructed like a Martin model--but which one. I believe the top is Spruce and the sides/back Mahogany.

Here are the pictures..