This is a Martin Custom Shop Martin CSN20 based on the N20 built as a Winer NAMM exclusive

Guitar Specs are as follows:

Model: Custom Nylon
Construction: Standard: Mahogany Blocks/Dovetail Neck Joint
Body Size: N Style Classic
Top Material: Sitka Spruce
Top Grade: 4
Top Braces: Sitka/NonScalloped 5(Classic Bracing)
Pattern: 000  N-Style Classic- 18A
Top Binding: European Flamed Maple
Top Inlay: .027" B/M - .042" B/M/B
Rosette: Wood Mosaic N Style 
Back Material: Solid East Indian Rosewood
Back Panels: 2 Pc
Purfling: Style 35 w/Black Fiber Strip on each side
Center Strip/Loc Stamp: Sitka Standard (C F Martin & Co Nazareth PA Between 1st /2nd Brace)
Caution Stamp: Made for Nylon Strings
Back Braces: Sitka Spruce
Back Binding: European Flamed Maple
Back Inlay: .042" Black/Maple/Black Fiber
Sides: Solid East Indian Rosewood
Side Inlay: .042 B/M/B Fiber
Side Strips: Sitka Spruce
Endpiece: Style 35 Backstrip
Endpiece Inlay: .030 Black Fiber
Neck Material: Genuine Mahogany
Neck Shape: Classic
Headstock Shape: Classic Head Profile / Slotted - Round Slots /6 String / No Diamond-N-20
Back/Head Stamp: C.F. Martin & Co. Nazerath Pa. Stamp on Back Of Head 
Truss Rod: NR,Adj, 2-Way 12 Fret, 26.44, 335mm
Heelcap: European Flamed Maple with B/M/B Inlay
Nut Material: Bone 
On Angle/Flat: On Angle
Headplate Material: Black Ebony
Tuning Machines: Sloan Bronze Classic 6705 Side Mount w/ Lg Ivorid Buttons
Fingerboard Material: Black Ebony/Fingerboard End Rounded to Fit Soundhole
Radius: None
Scale Length: 26.44 Flat
Width at Nut: 2 1/8" 
Width at 12 Fret: 2 3/8"  
Fret Wire: G-300
Frets Clear: 12
Frets Total: 19 
Side Dots: White Boltaron
Side Dot Position: One at 3rd, 5th, 7th, 10th, 12th &15th Frets
Finish Type: Gloss/Satin Neck
Finish Body: Goss
Finish Top: Gloss
Finish Neck: Satin
Bridge Material: Black Ebony
Bridge Style: Classic
String Spacing: 2 5/16"
Saddle: Flat Bone No Radius
Strings: M-120 Silverplated High Tension