I have a newer Sigma also, a Korean one that almost replicates a Martin Dreadnought, but it is entirely ply veneer, even the top. As for build quality it is really good, the bracing could be trimmed but until I decide to put a new bridge on it it plays just fine. I think that is because of the bridge having that metal adjuster deal, if the strings were in direct contact with a bone saddle instead of that adjustable thing it would sound as good,maybe better since the top is a tighter grained and higher quality spruce. It's very light, beautiful neck with that slight edge that fits a hand so nice and the overall sound is comparable to my friends older Martin with just a tad less woodiness.
The instrument is in close to perfect condition ,looking like it was played in it's youth agressively with a few strumming type indentations at the bottom of the guard and then cased and closeted, which is how I found it. On the sides, with the curves needing to have more integrity with the bending process a good rosewood ply might be a better choice, but I don't know, I don't build them. The back is solid rosewood and the grain on the inside of the back matches the grain on the outside.the sides might be a rosewood ply veneer, it's hard to get a good look, except to say that the inside and the outside of the sides are both rosewood so it's either a high quality furniture grade rosewood ply veneer or it might be solid. Not sure about the year and such but the top is a solid spruce, the grain is clearly visible in the edges of the soundhole as a 'waterfall' effect with the grain dropping along the edges in a continuous fall.
#Sigma guitar model numbers serial number#
I just got a Sigma GRC-7 recently with the low serial number 798*, a four digit number.