It's a D-28 Authentic, based on 1937 specs, with thin lacquer finish, hide glue construction, and all the other turn-back-the-clock-80-years details. The "aged" part of the model code means the finish is artfully distressed a bit so the guitar doesn't look like a D-28 that was hidden under the bed and never touched. Instead it looks like an old Martin that saw real playing time back in the day. It certainly has the legendary old D-28 tone, plus the volume to deliver it.

stock no. 57484

ModelD-28 Authentic 1937 Aged
TopAdirondack Spruce with VTS
Back and sidesMadagascar Rosewood
Frets to body14
Nut width1 3/4''
Scale length25.4"
Bridge spacing2 5/16''
Bridge materialEbony
Fretboard MaterialEbony
Neck materialGenuine Mahogany
Inlay1937 Diamonds and Squares Long Pattern
Total frets20
BracingAuthentic 1937 Forward Shifted X Brace
Neck profileAuthentic 1937
BindingAntique White, Bold Herringbone
TunersAged Waverly Nickel Open Back
FinishVintage Gloss - Aged
CaseOrig. Hard
Serial No2338679