acoustic · orchestra model
OM-28 / OM-21
| Maker | C.F. Martin & Co. |
|---|---|
| Origin | United States |
| Type | acoustic · orchestra model |
| Introduced | 1929 |
| Price | USD 3699.99 (2026-09) |
| Maker founded | 1833 |
| Status | current |
Martin's orchestra model in two versions, the rosewood OM-28 and the OM-21, on a 25.4-inch scale.
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Why it matters
The OM is Martin's 000 body with the longer 25.4-inch scale, which gives it more string tension and a slightly brighter, more articulated response than the short-scale 000. The OM-28 is the current Standard Series model, listed at $3,699.99 at Sweetwater with a Golden Era Modified Low Oval neck. The OM-21 is a retired model, so examples are secondhand.
Note
The 000 with 25.4" scale — arguably the most versatile acoustic shape ever.
Specifications
- Scale length: 645 mm (25.4 in)
- Neck shape: Golden Era (GE) Modified Low Oval
Before you buy
- $3,699.99 for the OM-28 at Sweetwater in September 2026
- the OM-21 is out of production, so that name means secondhand
- the 25.4-inch scale separates the OM from the short-scale 000
Other opinions
One video is one opinion. These are the other videos for this entry, most-viewed first. The order is the view count, not a ranking of ours.
WM SOUND Guitars 원미사운드 · 2022-12 · 163,734 views
“Mic : B&K type 4006 Camera : Fuji Played by JoiL Both of two Guitars - Martin MA540 Strings - Sitka / I.Rosewood - Re-imagined Model”
Back-to-back comparison of an OM-28 and a 000-28.
Acoustic Letter · 2015-04 · 66,952 views
“MORE INFO: Give us a call at (406) 290-9390 or email us at sales@musicvilla.com for more information.”
Acoustic Letter plays an OM-21 to demonstrate its voice.