Here is a cut and paste from the email i received from Martin concerning the guitar i recently purchased.. It sounds like a limited quantity run. It is simular to the se-40t except it has a tear drop shaped inlay on each side of the twelveth fret marker




The CFM-2RTT Sigma was a for runner of the Sigma SE Series in the late80S early 90S. In 1992 it was cataloged as a SE-40T. The guitar was
constructed with a Sycamore top and was avaliable in
Burgandy,Blue,Black,and Tobacco Sunburst. There is no record of
production totals or Manufactures Suggested Retail Price.

Thank you for contacting the C.F. Martin Co. Inc.,