Martin's Size 5 guitar body is the only Model number guitar to be produced after the 1930s. The Model 5-18 was produced through 1989 and various other models have been produced as one-offs during the 20th century. The Size 5 is also often referred to as a "Terz" guitar because they are often tuned one-third higher than standard guitars. In the late 1990s, the Size 5 guitar was introduced with the Size 5 Mini Martin and the reintroduction of the 5-15 in Martin's mahogany 15 Series. The small body size has also been utilized on Claire's Guitar - a limited edition model built for Chris Martin's daughter, Claire.
Size 5 dimensions: 11.25 in. lower bout width, 3.875 in. body depth, 16 in. body length, and 21.4 in. scale (1898-1924) or 22 in. scale (1924-present).
Martin produced five other Size 5 guitars in limited quantities including three Model 5-30s (1900-02), one Model 5-34 (1899), one Model 5-35 (1971), two Model 5-42s (1921-22), and one Model 5-45 (1922). For the recent production of the Model 5-15, refer to the 15 Series.