Serial: 3073322

This Martin Custom Shop 18 Style OM was designed by Tone Shop Guitars and built around a set of Sinker mahogany selected for this custom run. Paired with an Adirondack spruce top, the result is a refined 18-style OM with a dry, warm fundamental, strong projection, and the wider dynamic range that makes Adirondack such a great fit for this body shape.

The 000/OM Auditorium body keeps the response balanced and focused, making this a strong choice for fingerstyle, flatpicking, recording, and vocal accompaniment. The Adirondack top gives the guitar plenty of headroom and clarity, while the Sinker mahogany back and sides bring warmth, directness, and a woody character that feels right at home in an 18-style build.

Adirondack spruce scalloped X-bracing with Golden Era hand shaping helps this OM feel open and responsive without losing control. The long 25.4" scale length adds a little extra snap and definition, while the 2 5/32" string spacing leaves plenty of room for detailed right-hand work.

The neck features a Modified V profile with High Performance Taper, a 1 3/4" nut width, and a black ebony fingerboard with long diamonds and squares inlays. Brown faux tortoise binding, an Old Style 18 Boltaron rosette, faux tortoise pickguard, black ebony bridge and headplate, CFM block inlay, and Grover nickel StaTite tuners complete the build.

Highlights

• Tone Shop Guitars-designed Martin Custom Shop build
• Custom 000/OM Auditorium body
• Adirondack spruce top
• Sinker mahogany back and sides
• Adirondack spruce scalloped X-bracing
• Golden Era hand-shaped bracing
• Modified V neck profile with High Performance Taper
• 25.4" scale length
• 1 3/4" nut width
• Black ebony fingerboard with long diamonds and squares inlays
• Brown faux tortoise binding
• Old Style 18 Boltaron rosette
• 5-ply hardshell case included

Specifications

Body

• Model: Martin Custom Shop 18 Style OM
• Body Shape: 000/OM Auditorium
• Top Material: Adirondack Spruce
• Back & Sides Material: Sinker Mahogany
• Body Depth: Standard
• Top Bracing Material: Adirondack Spruce
• Top Bracing Pattern: X-Brace
• Top Bracing Shape: Scalloped
• Top Bracing Style: Golden Era with Hand Shaping
• Top Bracing Size: 1/4"
• Binding Material: Brown Faux Tortoise
• Rosette Style: Old Style 18 Boltaron
• Back Purfling: Style 18
• Endpiece Material: Brown Faux Tortoise
• Pickguard Material: Faux Tortoise
• Top Color: Aging Toner
• Finish Package: Gloss Body with Satin Neck and Polished Headplate

Neck

• Neck Material: Select Hardwood
• Neck Joint: Dovetail
• Neck Profile: Modified V
• Neck Taper: High Performance Taper
• Headstock: Solid
• Headplate Material: Black Ebony
• Headplate Inlay: CFM Block
• Headplate Inlay Pearl Species: Select Abalone
• Fingerboard Material: Black Ebony
• Fingerboard Radius: 16"
• Fingerboard Width at Nut: 1 3/4"
• Fingerboard Width at 12th Fret: 2 1/8"
• Fingerboard Inlay: Diamonds and Squares Long
• Fingerboard Inlay Pearl Species: Select Abalone
• Scale Length: 25.4"
• String Spacing: 2 5/32"
• Total Frets: 20
• Nut Material: Bone

Hardware

• Bridge Material: Black Ebony
• Bridge Style: GE Modern Belly
• Saddle Style: Drop-In Saddle
• Saddle Material: Compensated Bone
• Bridge Pins: Ebony
• End Pin: Ebony
• Tuning Machines: Grover Nickel V97-18NA StaTite 18:1 Vintage Button

Electronics

• Electronics: None

Miscellaneous

• Orientation: Right-Handed
• String Number: 6 String
• Strings: Authentic Acoustic Lifespan 2.0
• String Gauge: Light
• Case: 5-Ply Hardshell
• Custom Shop Credentials Book: Yes

Why Buy from Tone Shop Guitars?

At Tone Shop Guitars, we specialize in hand-selected premium and Custom Shop instruments built for serious players and collectors. Every guitar we bring in is chosen for feel, resonance, visual character, and musical usefulness—not just specs on paper. When you buy from Tone Shop, you’re getting an instrument we genuinely believe in.