Custom 7 String Archtop Guitars - Now Customizable through the Halo Archtop Guitar Customization Tool.
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Some background info about 7-string hollow body guitars is copy/pasted below from Wikipedia:
Semi-hollow and hollow body electric guitars
In the United States, the jazz guitarist George Van Eps had a seven-string guitar built for him by Epiphone Guitars in the late 1930s and a signature Gretsch seven-string in the late 60s and early 70s. The Van Eps signature guitar may be the first regular-production seven-string electric guitar. Van Eps tuned his 7th string to A.
Several others began using seven-string guitars after Van Eps, including Bucky Pizzarelli, Howard Alden, Ron Eschete, Chance Russell, and John Pizzarelli, son of Bucky Pizzarelli. Lenny Breau also used seven string instruments, but whereas the other players all used instruments with an added bass string, Breau had at least one instrument in which the seventh string was an added treble string, tuned to the 'A' above the high 'E' string (A4). At the time he began using the high A string, no commercially manufactured string could withstand being tuned that high, so Breau substituted a piece of monofilament fishing line of appropriate gauge. A year later advances in materials science allowed the La Bella company to begin manufacturing a custom string for Breau's high A.
Seven-string semi-acoustic archtop guitars were used by jazz-guitarist Ralph Patt after he began exploring major-thirds tuning in 1964. Patt's tuning is a regular tuning, in the sense that all of the intervals between its successive open strings are major thirds; in contrast, the standard guitar-tuning has one major-third amid four fourths. Major-thirds tuning has a smaller scope than standard guitar-tuning, and so Patt started using seven-string guitars, which enabled major-thirds tuning to have the E-e' range of the standard tuning. He first experimented with a wide-neck Mango guitar from the 1920s, which he modified to have seven strings in 1963. In 1967 he purchased a seven-string by José Rubio.
The first seven-string electric guitars were built in the "hollowbody" or "semi-hollow" archtop styles, where the guitar has a central resonating chamber, or a central block with resonant chambers on the sides. This gave the guitar the dark woodiness, breath, and richness that is associated with traditional "jazz" tone, but also made prone to feedback at high volumes, making it problematic for rock guitar playing.