This is a Martin Custom Shop 12-Fret Sinker Mahogany Dreadnought Features Hand Selected Wood Sets From NAMM 2018.

Guitar Specs are as follows:

Model: Custom D-12-Fret
Construction: Standard: Mahogany Blocks/Dovetail Neck Joint
Body Size: D-12 Fret
Top Material: Adirondack Spruce
Top Grade: 3-4
Top Braces: Adirondack/Scalloped 5/16"/Standard
Pattern: D-12 Fret #7A
Top Binding: Black Ebony
Top Inlay: Style 28 Black / Maple Wood Inlays
Rosette: Fine Herringbone (Style 28)
Additional ROS Inlay: Black / Maple Fiber
Pickguard: Faux Tortoise
Back Material: Sinker Mahogany
Back Panels: 2 Pc
Purfling: Style 28 w/18 Strip on each side
Center Strip/Loc Stamp: Sitka Spruce (Standard-C F Martin & Co Nazareth PA Between 1st /2nd Brace)
Back Braces: Sitka Spruce
Back Binding: Black Ebony
Back Inlay: .042" Black/Maple/Black Fiber
Sides: Sinker Mahogany
Side Strips: East Indian Redwood
Endpiece: Black Ebony
Endpiece Inlay: .042" B/M/B Fiber
Neck Material: Genuine Mahogany
Neck Shape: Peforming Artist Neck Profile
Headstock Shape: Slotted / Square Slots / 6 String Diamond
Back/Head Stamp: C.F. Martin & Co. Nazerath Pa. Stamp on Back Of Head (Authentic Feature)
Truss Rod: NR,Adj, 2 Way, 12 Fret, 26.44, 335mm
Heelcap: Black Ebony
Nut Material: Bone 
On Angle/Flat: Flat
Headplate Material: Solid East Indian Rosewood 
Headplate Decal: Old Style Gold(Small)
Tuning Machines: Grover Nickel H97-18NA Sta-Tite Side Mnt 18:1 (Drill in MR) 
Fingerboard Material: Black Ebony 
Radius: 16"
Scale Length: 25.4" 
Width at Nut: 1 3/4" 
Width at 12 Fret: 2 1/8"  
Fret Wire: German .043 Notched 1 3/4
Frets Clear: 12
Frets Total: 20 
Pearl Inlay: Foden Style (Select Abalone) 
Side Dots: White Boltaron
Side Dot Position: One at 3rd, 5th, 7th, 9th, Two at 12th, One at 15th & 17th Frets
Finish Type: Gloss/Satin Neck
Finish Body: Goss
Finish Top: Gloss - Amber Tone 1933
Finish Neck: Satin
Bridge Material: Black Ebony
Bridge Style: Modern Belly - Drop in Saddle
String Spacing: 2 5/32"
Saddle: 16" Radius/Compensated/Bone
Strings: Martin MSP4200
Bridge Pins: White w/Faux Tortoise Dots
End Pin: White w/Faux Tortoise Dot