Martin OM21 Standard Acoustic Guitar

Sitka Spruce & East Indian Rosewood Orchestra Model acoustic with hardshell case

Written by

Sam Beattie

Martin’s Standard OM-21 is an Orchestra Model acoustic that sits proudly among their finest instruments. The combination of Sitka Spruce and East Indian Rosewood ensures an articulate, crisp tone, with a Dovetail neck joint and scalloped X bracing maximising resonance. A beautifully-crafted instrument with a sound for every style.  

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Body & Neck

As mentioned above, Sitka Spruce has been used for the OM-21’s top. This classic tonewood is renowned for its resonance and rich volume, and is something of a go-to for acoustic guitar tops. Martin opted for East Indian Rosewood for the back & sides, a luxuriously warm tonewood that sounds as good as it looks.

The hardwood neck features a smooth satin finish for extra comfort. A modified low oval shape is combined with a high performance taper to ensure pristine playability, regardless of your style. Finally, the fretboard is Ebony, with its contrasting dark appearance and emphasised attack – Martin also used the renowned Plek process for the neck, ensuring absolute precision and consistency.


The hardware and construction of the OM-21 is the icing on the cake. A ‘30s-style drop-in Ebony bridge perfectly harnesses the resonance of the Sitka Spruce top. Nickel open-gear tuners are easy-access and precise in their tuning stability – plus they look the part.

All-in-all, the OM-21 is a guitar that’s been lovingly crafted to near-perfection – you simply won’t want to put it down.



  • Body Size: 000-14 Fret
  • Top Material: Sitka Spruce
  • Back Material: East Indian Rosewood
  • Side Material: East Indian Rosewood
  • Top finish: Gloss
  • Top Colour: Aging Toner
  • Back and Side Finish: Gloss
  • Rosette: Style 28 Multi-Stripe
  • Bracing Pattern: X Brace
  • Brace Shape: Scalloped
  • Back Purfling/Strip: Style 18
  • Endpiece: Faux Tortoise
  • Binding: Faux Tortoise


  • Neck Material: Select Hardwood
  • Fingerboard Material: Ebony
  • Neck Shape: Modified Low Oval
  • Neck Taper: High Performance Taper
  • Construction: Dovetail Neck Joint
  • Nut Material: Bone
  • Scale Length: 25.4"
  • Neck Joins Body At: 14th Fret
  • Number of Frets Total: 20
  • Fingerboard Inlay Material: Mother of Pearl
  • Fingerboard Inlay Style: Style 28
  • Side Dots: White
  • Finish Neck: Satin
  • Neck Colour: Dark Mahogany


  • Bridge Material: Ebony
  • Bridge Style: 1930 Style Belly - Drop in Saddle
  • Saddle: Compensated Bone
  • Saddle Radius: 16"
  • Tuning Machines: Nickel Open Gear
  • Knob: Butterbean
  • Bridge Pin Material: Black Plastic
  • Bridge Pin Dots: White Plastic
  • Pickguard: Faux Tortoise
  • Case: Ply Hardshell
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