Custom Shop Build Overview

This Martin Custom Shop D-18 Style McGuinn 7-String Dreadnought is a rare and inspiring build featuring a unique tonal concept originally made famous by Roger McGuinn. This configuration adds a doubled high G string, delivering the shimmer and harmonic richness of a 12-string while maintaining the power and focus of a traditional dreadnought.

This particular guitar features a hand-selected Bear Claw Sitka spruce top paired with solid mahogany back and sides, personally chosen during a visit to the Martin factory. The bear claw figuring adds visual character while the Sitka top delivers clarity, headroom, and dynamic response.

Built on the classic D-18 platform, this Custom Shop instrument blends vintage-inspired tone with a distinctive layered shimmer that enhances strumming, vocal accompaniment, and open chord work.

Tone & Performance

The addition of the high octave G string introduces a natural chorus effect, enriching the tonal spectrum without overwhelming the fundamental voice of the guitar.

Classic D-18 warmth with added harmonic shimmer
Enhanced fullness for strumming and vocal accompaniment
Clear note separation with a natural chorus-like effect
Powerful projection with controlled low-end response

The result is a highly musical and inspiring instrument that stands apart from standard 6-string dreadnoughts.

Custom Shop Craftsmanship

Handcrafted in Nazareth, Pennsylvania, this guitar features Martin’s traditional dovetail neck joint and premium tonewood construction for maximum resonance and long-term stability.

The Forward Shifted Golden Era scalloped Adirondack bracing allows the top to move freely, enhancing responsiveness and dynamic range.

The distinctive 7-string pyramid bridge completes the build, supporting the unique string configuration while maintaining vintage-inspired aesthetics.