The first doubleneck is a Gibson EDS-1275. This is the guitar that was used during the Guns N’ Roses Use Your Illusion World Tour (Only Women Bleed / Knockin’ On Heavens Door, Patience). It’s based on a Gibson SG with a 6-string neck and a 12-string neck. Slash also used this guitar during the Contraband tour. For the Aerosmith cover “No More, No More” both sets of E strings on the 12-string neck where tuned to dropped D. The EDS-1275 is a Re-Issue that was painted black. The model in the picture below is an older one. You can distinguish both, because the re-issue has darker wood on the 12-neck than on the 6-neck.
During the Use Your Illusion tour in 1993 Slash had a guitar built by Guild. The red Guild Crossroads has a 12-string semi acoustic at the top and a 6-string electric at the bottom. According to various sources, he drew his design on a napkin. When he switches to the acoustic part of the guitar on stage, his guitar tech Adam Day switches from the Marshall amps to the Ampeg SVTMP tube pre-amp (see picture above – this pre-amp is also used for the acoustic parts played with Slash’s current Les Paul Signature and the built-in piezo pickup) which goes straight to the FOH (front of house). You can see this guitar in the Estranged music video.
The Prototype of this guitar is a 6/6-string version with a natural finish. It’s shown in the picture with 5 doublenecks (4th from the left). This guitar can be seen in the beginnig and end of the Dead Horse video.
From left to right: 1980 B.C. Rich (Rich Bich) doubleneck with DiMarzio Pickups (serial# 82510); Slash-designed 1993 Guild that has a hollowbody 12-string with piezo pickup and soundhole on top, and a 6-string with two humbuckers on the bottom (the 3rd of only three in existence); 1967 ES-1275 Gibson (serial# 848981); Guild Crossroads prototype (both 6-strings); Slash-designed Guild (both 6-strings).
During the Slash’s Bluesball and beginning of the Snakepit 2000 era, he used a green Guild called “Godzilla”. This is a 12/6 string version like the red one and was used for Knockin’ On Heavens Door. Later on during the Snakepit tour, Slash switched to a black 6/6 string Guild (5th from left). The backup for this guitar has similar specs, but is in turquoise. It was used for “Serial Killer”. The same guitars were also used on the Contraband tour for “You Got No Right”.
Slash also used 2 Gibson EDS-1275’s (a white and a red one) for the song “Wish You Were Here”.
All Guild crossroads have Seymour Duncan Alnico II pro pickups on the electric part (these are also used for Slash’s Les Pauls). The pickup on the acoustic side is a piezo-style under the saddle. The 6/6 string versions have 0.12 to 0.52 Ernie Ball Phosphor Bronze strings.
(sources: Guitar Shop Magazine October 1996, Fachblatt Musikmagazin)