Hey, I own a Martin Sigma SE -19, serial 11979, with case and 'dust cover'. All the info I could find on it aside from made in japan stamp and that it was one of the early 'special' made - acoustic with pickups.
It has great sound after all these years - got it in '84 and even crappy strings sound good on it.
No one at the local stores when they had their 'experts' come in could even find it or knew what it was.
its a great guitar and I love it to death but want to know more about it - any ideas or help??