Acoustic Guitars/Sigma DR-35


What might you tell me about my DR-35, with a head-stock serial number 905055, and another number on one of the back spines, S23677.

I purchased my Sigma (and hard shell case) at a thrift/antique shop in northern Maryland a couple of years ago for $300.00.  

Since then, I've had the nut and bridge/saddle replaced with bone, as well as the neck (including frets) readjusted/set-up for light strings.

Thanks for any feedback, Alan.

Sigma DR-35
Sigma DR-35  
Hi. Thanks for your inquiry. I do think I can help you but I am going to need some additional information. Please send me some clear, well lighted jpeg format images using your camera, not a cell phone, on the ‘macro’ setting if possible of the following:
A full front (obverse) view of the entire instrument
A full rear (reverse) view of the entire instrument
A full front (obverse) view of the headstock including the nut and the first three frets
A full rear (reverse) view of the headstock and at least 5 inches of neck
Clear well lighted images of any interior marks, stamps and/or labels
Since serial numbers, per se, are not really important in most cases concerning Sigma by Martin instruments, I will not be in need of those, however, I do want to impress upon you the importance of being able to clearly read the interior label or stamps. You can also go to my website for mor info. Please check out a ful front image of one of my DR-35's.

The quicker I receive these, the faster I can get the results back to you. Thanks again. Kevin

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Kevin Dunham


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


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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