The 1966 Martin D-21 is a full-size dreadnought acoustic guitar constructed with a solid Sitka spruce top and Brazilian rosewood back and sides, creating a warm, resonant tone with strong projection and clarity. The body is appointed in Style 21 trim, featuring simple black and white binding and a multi-ring rosette. The gloss natural finish accentuates the rich wood grain, while the traditional dovetail neck joint ensures excellent tonal transfer and sustain.

The mahogany neck is topped with a Brazilian rosewood fingerboard that includes small dot inlays and 20 frets. Its 25.4-inch scale length and 1 11/16-inch nut width offer a comfortable playing experience suitable for both fingerstyle and flatpicking techniques. The neck profile reflects Martin’s mid-1960s design, combining vintage feel with exceptional responsiveness. The craftsmanship and wood selection from this era contribute to the guitar’s balanced tonal range, from deep bass to articulate highs.

Hardware and appointments include an ebony bridge with bone saddle, patent pending Grover tuners, and a traditional tortoiseshell-style pickguard. The internal bracing follows Martin’s X-brace pattern, enhancing volume and resonance. Every detail of the 1966 Martin D-21 reflects the company’s commitment to high-quality acoustic construction, resulting in a timeless instrument prized for its tone, playability, and enduring craftsmanship.