Serial: 3084597

The Martin Custom Shop 000-28K 1921 recreates the character of an early all-koa Martin with highly figured koa throughout the body, period-inspired construction, and a spacious 12-fret design. Available exclusively through Martin Custom Shop Expert dealers, it blends one of Martin’s most distinctive historic configurations with modern Custom Shop execution.

The 000 12-fret body uses highly figured koa for the top, back, and sides, finished in a thin Vintage Gloss that lets the natural figure remain the focus. Grained ivoroid binding, fine herringbone top inlay, and a faux tortoise pickguard installed beneath the finish reinforce the early-Martin aesthetic.

Traditional hide glue construction is paired with VTS-treated Authentic scalloped Adirondack spruce X-bracing. The combination is designed to bring vintage-inspired responsiveness to the all-koa body while preserving the long 25.4" scale associated with the OM/000 family.

A genuine mahogany neck uses Martin’s Authentic 1921 profile and joins the body at the 12th fret. The ebony fingerboard carries Golden Era Diamond & Square short-pattern inlays, while the unusually wide 1 7/8" nut gives the guitar a distinctly traditional feel.

A slotted headstock with Golden Age bright nickel side-mount tuners, ebony pyramid bridge, bone saddle, and hardshell case complete the package.

Highlights

• Highly figured all-koa top, back, and sides
• 000 12-fret body with 25.4" scale
• VTS-treated Authentic scalloped Adirondack spruce X-bracing
• Traditional hide glue construction
• Authentic 1921 neck profile with wide 1 7/8" nut

Specifications

Body

• Body Style: 000, 12-Fret
• Top Wood: Highly Figured Koa
• Back Wood: Highly Figured Koa
• Side Wood: Highly Figured Koa
• Bracing Pattern: X-Brace
• Bracing: Authentic Scalloped Adirondack Spruce with VTS
• Construction: Traditional Hide Glue
• Binding: Grained Ivoroid
• Top Inlay: Fine Herringbone
• Pickguard: Faux Tortoise, Under Finish
• Top Color: Natural
• Body Finish: Vintage Gloss

Neck

• Neck Material: Genuine Mahogany
• Neck Shape: Authentic 1921
• Neck Joint: 12-Fret
• Scale Length: 25.4"
• Fingerboard Material: Ebony
• Fingerboard Inlays: Golden Era Diamond & Square Short Pattern
• Nut Width: 1 7/8"
• Number of Frets: 20
• Neck Finish: Vintage Gloss
• Headstock: Slotted

Hardware

• Bridge: Ebony Pyramid
• Saddle: Bone
• Tuners: Golden Age Bright Nickel Side Mount

Miscellaneous

• Electronics: None
• Recommended Strings: Martin Authentic Acoustic Lifespan 2.0 Light
• Case: Hardshell Case
• Availability: Martin Custom Shop Expert Dealers

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.