Great site for all Sigma nuts! Hope we hear from Sterling Webb sometime soon. I have a Sigma with a combination of wood, coloring and markings unlike any guitar I have seen before or after. I still think that it is the best looking acoustic (any brand!) I have ever seen. It has quilted maple sides, back and headstock bound in tortoise shell with a thin white stripe. The neck is 20 frets with tortoise shell binding. It has snowflake pearl fret markings and a pearl rectangle with the name SIGMA in the 20th fret. The front binding also has herringbone as does the soundhole and down the back. The tuning keys are gold and enclosed with the Sigma stamp.

The logo on the headstock is "Sigma Guitars, Est. 1970". I bought this guitar around 1980 and the inside bracing has the Sigma Guitars Made in Japan for C.F. Martin stamp. The mystery is the model number. The stamp in the bracing is only partially readable. It looks like D-11 or D-21. I have never heard of a D-21 so I'm guessing D-11 but the first number is hard to make out. I have read Sterlings postings about DR and DM for Rosewood and Mahogany, but what about maple? Anyone heard of or seen a Sigma model fitting this description? I would love to know more about it. Is there any way to tell how many of this type were made and/or its value? Hope to hear more from Mr. Webb on this site. I wish Martin had as much history for us as he does.
Thanks,
DD