Dweezil Zappa [explains](http://www.premierguitar.com/articles/Dweezil_Zappa_Teases_Gibson_Frank_Zappa_Signature_SG_Prototype) that Frank's most famous Roxy-era Gibson SG was a Gisbon SG Special that was customized quite a bit before being effectively destroyed, as described in this [article from Gibson](http://www.gibson.com/News-Lifestyle/Features/en-us/frank-zappa-0902-2011.aspx).more
"One day I may type out the whole, strange, extremely unlikely story of how my little band [Mr. T Experience] wound up jamming, sort of, with Johnny Thunders in a New York cafe on one weird night in 1989. He had played my guitar (an old, junky SG) while I played Jon Von's. Afterwards, I removed the strings, coiled them, and put them in a string packet. Then I labelled the packet so I wouldn't accidentally re-use the strings. (Yes, I used to re-use old strings back then.) Then I put the packet in my guitar case. So yeah, Johnny Thunders played my guitar. And his sweat, and who knows what other "gear", in trace elements, are probably in the strings. I've never been able to identify it precisely. The body is an SG shape, with a dark brown finish where you can just make out the wood grain, but it doesn't look much like the Standard SG. For what it's worth, the neck feels 60's to me, and the decal on the headstock looks like the one on my late 50's and early 60's Les Paul Juniors, but unlike them it has uncovered humbuckers and Tune-O-Matic bridge as you can see. It could well be from the 70's. I really have no idea what it is or whence it came. No serial number. Not the easiest guitar to play, but it sounds pretty good."more
She can be seen using her Gibson SG Special live numerous times, esp with LA-based band Marriages. She talks about her SG in Musicradar's interview with her: "I might have to save my acoustic Blueridge OM as I have written the most music on it other than my Gibson SG (which is maybe the most 'replaceable' guitar). Hard to choose."more
I just picked this up... its in a rare silver 'pewter' lacquer that matches me LP platinum, has a fat neck like my standard... haven't spent a lot time with her yet, but I am pleased to have another silver Gibson. I am sure a 70s t-top at the bridge will have her making 'jim' sounds. I will get to her when I have a sec....
Got this one pretty cheap. Lot of road wear but no broken headstock. Yay! Smooth player with amazing upper fret access. Stock 490 pups that do the job for now (will be replaced in the near future). My only gripe is the slight neck dive. Thinking of adding a Bigsby which might help with that