Martin Guitar Specifications
| Size | Frets | Width | Depth | Length | Introduced |
| O | 12 | 13 1/2 | 4 3/16 | 19 1/8 | 1852 |
| O | 14 | 13 1/2 | 4 1/4 | 18 3/8 | 1934 |
| OO | 12 | 14 1/8 | 4 1/16 | 19 5/8 | 1877 |
| OO | 14 | 14 5/16 | 4 1/8 | 18 7/8 | 1934 |
| OOO | 12 | 15 | 4 1/16 | 20 7/16 | 1902 |
| OOO | 14 | 15 | 4 1/8 | 19 3/8 | 1934 |
| OM | 14 | 15 | 4 1/8 | 19 3/8 | 1929 |
| D | 12 | 15 5/8 | 4 3/4 | 20 15/16 | 1931 |
| D | 14 | 15 5/8 | 4 7/8 | 20 | 1934 |
Martin Designations: