Yamaha SG1000 XU shown here is a variation on a theme. Note that it dates to 1984 - that is probably very relevant given that it was the era of hair metal and that whole phase of rock music getting widdlier and widdlier. The SG100XU is fitted with a locking tremolo and locking nut - they look to be proprietary units - note that there is a spring cavity on the rear of the guitar, a la Strat, and the trem block is clearly visible.
G L Wilson
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