Amazon.com: SIGMA 40” Acoustic Guitar, OOO, 4/4 Full-Size, with D'Addario EXP16 Strings, Solid Spruce Top, Vintage Tinted Gloss, Mahogany Back & Sides, Right(10A) : Musical Instruments
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Sigma Martin SBG2-9 Electric Guitar + Case / Tokai SG Copy / Ampeg Stud 1973-1974 Natural | Reverb
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Just Guitars Australia - Martin-Sigma E-18, circa 1981
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MARTIN PROTOTYPE SIGMA ELECTRIC GUITAR CIRCA 1979-1980. THIS IS AN EXTREMELY RARE PROTOTYPE MADE - Able Auctions
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1981 Martin Sigma SE-28 Acoustic Flattop w/ Cutaway Natural > Guitars Flattop Electric & Acoustic | Rivington Guitars
Sigma 00M-1SL-SB Acoustic Left Handed, Sunburst at Gear4music
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Martin Sigma SG SBG2 1972/1974 Vintage and original | Reverb
Martin Sigma DT-3 Vintage MIK Korea Acoustic Guitar 1970's Figured Chestnut | eBay
