I just came across this guitar yesterday. Talk about crazy. I asked the shop owner where I was if they had any 7 strings, as it was a place known for only classic and vintage gear. To my surprise, his answer was yes! And I wasn't ready. 1982 Gibson ES-335TD Seven String. One off custom from Kalamazoo. Played it and it sound like what it is, haha. Everything worked and the action was nice and low. Admittedly, I hate this particular Gibson bridge with a passion, but it rounds out the look of the guitar. They had no provenance of the guitar, which was interesting to me. It seems like SOMEONE would know who got Gibson to make a 7 string, or who owned it all these years. I'm thinking of making and offer on it, as I don't believe it is worth their asking price. IT is rare, it is unique, and its damn cool. Hope I can score it, but it was closing time yesterday when I was in there. Check out those cool amps behind me too!