I was introduced to this site looking for info on a sigma guitar that I have. the search led me to a discussion on this site the last entry was March '07. Anybody have any info on these? Mine is a DT 3 ser #255770 (I think - there is another # inside the body on the neck brace - 803125. ther is an oval shaped stamp visible thru the hole before the DT 3 stamp looks like it says "made in ???" not quite legible - maybe japan. The guitar plays pretty well - could use a little shaved off the nut and bridge - very nice wood - face is two piece with kind of red sunburst, sides wavy grain pattern , back wavy grain pattern with inlay down the middle. neck looks like mahogany, rosewood fingerboard.Decal in gold on the headstock says sigma guitars est 1970. Trying to determine value. need to sell or maybe trade for a small amp with reverb for my strat. Any help would be appreciated.