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Sigma by Martin guitars, Vintage Asian Import Guitars, acoustic guitars, american guitars, vintage music gear and vinyl record albums

Experience in the area

I am a scholar and researcher of vintage Asain Import guitars and my area of expertise is Sigma by Martin fretted instruments imported by C.F. Martin & Co. from 1970-2007. I have been compiling materials and studying Sigma since 2008.


I have my own website,, a blog, Sigma Martin Memo's, I am a consultant on the Vintage Sigma Guitars Facebook page and am an editor of the Sigma Guitars Wikipedia page. I am also writing a book on the sigma line and have just returned from MArtin in NAzareth where I was granted access to and permisiion to reproduce Sigma by MArtin materials by Dick Boak, Archivist at Martin. Martin customer service representatives now refer Sigma by Martin inquiries that they cannot answer to me.


My book propsal is currently under review by Hal Leonard Performing Arts Publshing group and an article I wrote for Vintage Guitar Mazine is under advisement.


Studied at Linn Benton Community Collage in Albany Oregon and Marylhurst University in Portannd, Oregon. I have been a lifelong musician and student of guitars and am a guitar tech.

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    K = Knowledgeability    C = Clarity of Response    P = Politeness
William03/17/17101010excellent answer thank you
jim12/04/16101010I appreciate your quick reply to my .....
Devon12/02/16101010Thanks so much, this means a lot .....
Andrew 11/29/16101010Answered my question and more! Considering I .....
Andy03/10/16101010Thanks again. I think that answers everything .....

Recent Answers from Kevin Dunham

2017-03-16 sigma DR28:

Hi. I assume your guitar is a DR-28 Sigma by Martin guitar made from 1970 until 2007 and not a Sigma produced by AMI Germany (made in China) or a Sigma distributed by St. Louis Music Corp. Unfortunatly

2016-12-11 Takamine accoustic guitar:

HI. What you have here is a pro built Takamine EC132SC Acoustic-Electric Classical Guitar. It has long been an outstanding value among classical guitars in its price range. This guitar is notable for its

2016-12-02 K Yairi Classical with no model number..:

Hi-Your classical guitar is made by Kazuo Yairi, or shall I say at his factory (gakki). K. Yairi is brother to S. Yairi, both guitar builders of some fame. Much has been written about these luthiers, their

2016-12-01 Hohner acoustic guitar:

Hi. This guitar, and many similar models from this era, are generally lower quality, entry level, and made  employing laminate construction. The materials were generally spruce for the top and mahogany

2016-12-01 Orpheum Guitar Info:

Hi Jim-thanks for the question-it gave me the chance to go over some of my research materials to hunt down a reference I read some time ago. Current contemporary thought is that your guitar was made by


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