Lore has it that Slash doodled the design on a napkin in 1993.
Guild accomplished the mission with a custom Crossroads Double Neck a year later.
A few may have hit the streets prior to 1997, but that was the first year it appeared in Guild’s catalog. It’s a 12-string chambered acoustic above a solid body electric 6-string.
Slash called his original green prototype “Godzilla”.
Specs: Mahogany body, Maple top, Maple necks, Rosewood fretboards (unbound on acoustic neck), Seymour Duncan humbuckers, Fishman UST for acoustic, Mini-toggle to switch between guitars, 2 volume and tone controls plus 3-way switch for electric
Five years before Slash doodled his vision for a 12-string acoustic and electric double-neck guitar there was Gary Shockley of Atco, NJ dreaming up the same thing.
Shockley did more than doodle. He applied for a U.S. patent in 1988 and it was granted in 1991. Patent # 4987815
Shockley’s design is intuitive and rather basic in many ways. A few key features:
Separate amp jacks for each guitar mounted on base of acoustic
Volume/tone controls for electric are on top of acoustic
No pickup selector switch
The acoustic has an internal microphone
The electric solid-body is more or less grafted onto a dreadnought shoulder then both are covered with the top.