The Gibson B series was a series of acoustic guitars manufactured by Gibson Guitar Corporation between 1961 and 1979, and as a reissue to a limited degree from 1991 to 1992. The series consisted of the three different models, the B-45, the B-25, and the B-15 (the Blue Book also lists a B-20, with a run of 500 units). The B-45 was only available as a 12-string edition; the B-25 was available as a standard edition, a 12-string edition, and a ¾ scale body edition; and the B-15 was only available as a standard edition. B-45 The B-45-12, a 12-string edition guitar introduced in 1961, was the first B-45 model guitar available and the first B series overall. The B-45-12 had a mahogany body and neck, spruce top, rosewood fingerboard, and a cherry sunburst finish, and was made with "round" shoulders for the 1961 – 1962 model year and "square" shoulders until the end of its production in 1979. Starting in 1963, the B-45-12-N was also available as a natural finish edition. From 1991 – 1992, Gibson manufactured a reissue of the B-45-12 with rosewood sides and back. B-25 Gibson introduced the B-25 in 1961 which featured a mahogany body (solid back, laminated sides), solid spruce top, and rosewood fingerboard like the B-45. The B-25 featured a smaller body than the B-45 and after 1965 they had a narrow neck (1 5/8" nut) while the earliest models had the standard 11/16" nut. Many came with a plastic bridge and ceramic adjustable saddle. Some B-25's had a cherry sunburst finish, but there were a limited number of ebony finish editions with white pickguards. There was also a natural finish B-25-N edition. Production of these standard B-25's ended in 1977. Gibson produced a "short scale" version of the B-25, the B-25 ¾, with the same features as the standard B-25 but with a ¾ size body and a different sunburst finish. Gibson manufactured this edition from 1962 through 1968. From 1966 – 1968, the natural finish B-25-N ¾ was also available. The short scale editions were marketed as "student" guitars. Two 12-string editions of the B-25 were also available starting in 1962. The B-25-12 had a cherry sunburst finish and was available through 1970. Gibson manufactured the natural finish B-25-12-N through 1977, the last year of production for all B series guitars. In 2012, Gibson Custom Shop launched the "Icon '60s" series,