Thanks again Blazer. You've been a wealth of knowledge on this. I do have the original case it came with. Very similar to the one pictured in the link you posted above that had sold for $3800. Only difference is the plush lining is orange in mine. I do not have the original bill of sale, but when I bought it from the girl in 72', it was very near mint. All of the road scars are my doing. As far as the fret wear, I've seen worse, and for as much time as I spent playing it and bending notes, there is still some tread left on the ole tires. lol If it were unplayable because of fret wear, I probably would have had it done years ago.
I bought my first Ibanez in 83'. It was a Roadstar with a locking Floyd set up, and a blazer headstock. That guitar opened up new ways of playing, especially the vibrato, that the Maestro could never do. It was also the beginning of many more Ibanez guitars in my collection. So from roughly that date to present, the SG has been a closet queen most of the time. All this talk about her has me wanting to give her a fresh change of strings and play her. I refer to my guitars as her for some reason. When I take her out, I'll try to get some better pics of the finish. Thanks again.
Note your other SG with factory Kahler. Some of the Kahlers will be stamped Gibson but others are marked Kahler. Also some of the Gibsons have a Kahler locking nut and others have a Gibson designed locking nut to go with the Kahler trem. There are all types of variations.
Just like when Bigsbys were put on guitars in the factory. Sometimes it would be a Fender so where it should say Bigsby, it may have the Fender "F". Right now the Ibanezes have the same Bigsby/Gretsch trems which say "Ibanez" on them.
The Bigsby thing can be really, really messy straight out of factory. When Gibson made their amazing and ground breaking ES-335 which had so many innovations like solid middle block, feedback resistant laminated top, and thin deep cutaway body, some of them had Bigsbys right from the factory, but all 335s had holes drilled for a stop tailpiece.
Now if you have a stop tailpiece holes and put in a stop tailpiece, then all is fine. But if you decide to make it a Bigsby model and have the holes for a stop tailpiece, then you are in trouble. Gibson shouldn't have drilled the holes in the first place on every guitar so a cheapo fix they had was pearloid inlays the size of the screw holes (6th picture on link below) or a lame plaque (8th picture). It almost looks like a botched mod but collectors will know this was early Gibson and what they did before they decided to not drill for a Bigsby model on later versions of the 335.
And just when Gibson had a great formula for their fixed bridge 335s with just enough sustain from the solid center block on stop tailpiece models, they had to go out and put a sustain killing trapeze tailpiece on their semi-hollowbody in later years for a period. Trapeze works well for full hollowbody guitars since there's no other choice, but the semi-hollow has enough wood to mount a stop tailpiece on and offer up sustain in the mix.