GIBSON produced the MODEL O between 1902 and 1907. It was one of Gibson's first mass produced models following the Orville Gibson's sale of his one-man company. Several sizes were available: standard (12" wide), concert (13" wide) and grand concert (16" wide). They also came with varying levels of ornamentation, binding and inlay (from the basic O, through O1, O2 to the fanciest O3). It initially had a paddle shaped headstock, this was changed to a slotted headstock in 1906

GIBSON manufactured the STYLE O ARTIST between 1908 and 1923

GIBSON sold the STYLE U HARP GUITAR between 1902 and 1939, although most were probably made before 1924. The Style U was the largest of the range of Gibson harp guitars with an overall length of 48" and width of 21". Initially the Style U had 18 strings - 12 sub-bass harp strings and 6 conventional fretted strings. The scale length of the guitar neck was 27.25" with the maximum scale length of 35.25" for the bass harp strings. Later models had a more conventional 25.5" scale length for the guitar neck.