 MARTIN | | Acoustic: Standard Orchestra (OM) Series | | Size OM (Orchestra Model) guitars feature a lower bout width of 15 inches, 4.125 in. depth, 19.375 in. length, and 25.4 in. scale. | | OM-18 | | - orchestra body style, solid spruce top, mahogany back and sides, round soundhole with rope pattern rosette (1/9/1 grouping), five-ply top binding, single-ply back binding with rosewood outer layer (1930-31) or black outer layer (1932-33), black backstripe, mahogany neck, 14/20-fret ebony fingerboard with pearl dot inlays, solid headstock with three-per-side banjo-style tuners with ivoroid buttons (1930-31) or regular right angle tuners (1931-33), ebony belly bridge, black bridge pins, small tortoiseshell pickguard (1930-31) or larger tortoiseshell pickguard (1932-33), available in Natural or Sunburst finish, 25.4 in. scale, total production of 765 instruments, mfg. 1930-33. |
| OM-18P Plectrum | | - similar to the 0M-18, except in four-string plectrum configuration with two-per-side tuners and a 27 in. scale, total production of 95 instruments, mfg. 1930-31. |
| OM-21 | | - orchestra body style, solid Sitka spruce top, solid East Indian rosewood back and sides, round soundhole with Style 28 rosette, tortoise color binding, select hardwood neck, 14/20-fret rosewood fingerboard with Style 28 dot inlays, rosewood headstock overlay with raised gold foil logo, three-per-side chrome tuners, rosewood bridge, black bridge pins with white dots, available in Natural or Sunburst (optional) finish, 25.4 in. scale, mfg. 1993-present. |
| OM-21 Special | | - similar to the OM-21, except has a three-stripe patterned herringbone rosette, fine herringbone backstripe, mulitple black/maple top inlay, maple back binding, solid black ebony endpiece with maple fiber inlay, an ebony fingerboard with Style 21 select abalone square inlays, a large old-style Martin logo, three-per-side Gotoh nickel open-geared tuners, ebony bridge, ebony bridge pins with ivoroid dots, and a Delmar tortoise color beveled pickguard, mfg. 2007-present. |
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| OM-28 | | - orchestra body style, solid spruce top, Brazilian rosewood (1929-1933) or Indian rosewood (1990-96) back and sides, round soundhole with three-ring rosette (5/9/5 grouping), ivoroid (1929-1933) or white (1990-96) top and back binding, zig-zag backstripe, mahogany neck, 14/20-fret ebony fingerboard with slotted diamond inlays, rosewood headstock overlay, three-per-side chrome banjo tuners (1929-1931) or regular right angle tuners (1932-33, 1990-96), ebony pyramid bridge (1929-1930) or belly bridge (1931-33, 1990-96), white bridge pins with black dots, small tortoise (1929-1931), large tortoise (1932-33) or black (1990-96) pickguard, available in Natural finish, 25.4 in. scale, mfg. 1929-1933 (total production of 487 instruments) and 1990-96. |
| OMC-28E Cutaway Electric | | - similar to the OM-28, except has a single cutaway and Fishman Ellipse Aura System electronics, mfg. summer 2006-present. |
| OM-35 | | - orchestra body style, solid Sitka spruce top, solid three-piece Indian rosewood back, solid Indian rosewood sides, round soundhole with Style 28 rosette, white boltaron binding, B/W/B top inlay, B/W back inlay, mulitple B/W side inlay, Style 35 back purfling, mahogany neck, 14/20-fret ebony fingerboard with Style 28 pearl dot inlays, rosewood headstock overlay with raised gold foil logo, three-per-side Gotoh tuners with large buttons, ebony belly bridge, white bridge pins with black dots, black pickguard, Natural polished gloss finish, 25.4 in. scale, mfg. 2003-mid-2007. |
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| OM-41 SPECIAL | | - orchestra body style, solid Sitka spruce top, solid East Indian rosewood back and sides, round soundhole with Style 45 three ring abalone pearl rosette, grained ivoroid binding, Style 41 abalone top inlay, B/W boltaron back inlay, select hardwood neck, 14/20-fret bound ebony fingerboard with Style 45 abalone pearl snowflake inlays, bound headstock with rosewood headstock overlay and abalone pearl vertical block Martin logo, three-per-side gold tuners with butterbean knobs, ebony bridge, white bridge pins with abalone pearl dots, tortoise pickguard, Natural polished gloss finish with Aging Toner, 25.4 in. scale, mfg. 2005-06. |
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| OM-42 | | - orchestra body style, solid Sitka spruce top, solid East Indian rosewood back and sides, round soundhole with Style 45 three-ring abalone pearl rosette, grained ivoroid binding, abalone pearl with B/W/B boltaron top inlay, B/W boltaron back inlay, Style 45 back purfling, select hardwood neck, 14/20-fret ebony fingerboard with Style 45 select abalone pearl snowflake inlays, bound headstock with rosewood overlay and select abalone pearl vertical Martin block inlay, three-per-side gold Gotoh open-geared tuners with butterbean knobs, ebony bridge with two abalone pearl snowflake inlays, white bridge pins with abalone pearl dots, tortoise color beveled pickguard, available in Natural or Sunburst (optional) polished gloss with Aging Toner finish, 25.4 in. scale, mfg. 1999-present. |
| OM-42 Koa | | - similar to the OM-42 Koa, except has solid highly flamed Hawaiian koa back and sides, mfg. 2005-mid-2008. |
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| OM-45/SOM-45 | | - orchestra body style, solid spruce top, Brazilian rosewood (1930-32) or Indian rosewood (1977-1993) back and sides, round soundhole with abalone pearl rosette, ivoroid (1930-32) or white (1977-1993) top and back binding, abalone pearl top and side inlays, zipper pattern backstripe, mahogany neck, 14/20-fret ivoroid (1930-32) or white (1977-1993) bound ebony fingerboard with abalone snowflake (1930-32) or hexagonal (1977-1993) inlays, ivoroid (1930-32) or W/B/W (1977-1993) bound rosewood headstock overlay with abalone pearl toch (1930-32) or vertical block Martin logo (1977-1993) inlay, three-per-side gold banjo-style tuners with ivoroid buttons (1930-31) or regular tuners (1931-32, 1977-1993), ebony bridge, white bridge pins with abalone dots, small tortoise (1930-31) or large tortoise (1931-32, 1977-1994) pickguard, Natural finish, available as a Special Order, mfg. 1930-32 (total production of 40 instruments) and 1977-1993 (total production of 184 instruments). |
| OM-45 Deluxe | | - similar to the OM-45, except has abalone pearl pickguard inlay and abalone snowflake bridge wing inlays, total production of 14 instruments, mfg. 1930 only. |
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