Unfortunately, in general information on Sigma guitars is quite scarce. Aside from this forum, from which you will glean almost as much info on these Japanese guitars as there is to be found. THe only other place i have gotten Sigma information is from Sigma items on EBAY or from direct promotional material like old magazine adverts. As production moved to Korea(1984-93/94) then Taiwan(1993/94-2007) there became no back info especially since production of the Sigma was ended in 2007. But you said it best ... "The sound is really nice and it's a great guitar" That's all it comes down to.
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