1970s Sigma D18 acoustic guitar, made in Japan
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Vintage 1979 Sigma Martin DR-28H Acoustic Guitar~Made In Japan~RARE~Herringbone! | Reverb
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Sigma DR-7 Levin Sweden Western Guitar Used Made in Japan | eBay
SIGMA DM-18 acoustic guitars
NGD - A vintage made-in-Japan Sigma GCS 5 for the kids and me : r/AcousticGuitar
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1980 Sigma DR-41 – Natural …loaded w/Abalone! (Made in Japan) – GuitarPoint
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Sigma Guitars - Wikipedia
1978 Sigma DR-35 Dreadnought Made in Japan – Marrs Audio
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SIGMA Guitars
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Jaimie Muehlhausen // Vibrosonic Design
Sigma DR-41 Natural finish Japan 1983 vintage acoustic guitar v.good-excellent | eBay
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Vintage 70's Martin / Sigma DM-12-5 12 String Acoustic Guitar Made in Japan | Reverb
SIGMA DR-7 acoustic guitars
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