Sigma for Martin DR-28 acoustic guitar, made in Taiwan, circa 1980, ser. no. 80xxxxx5
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![Guitar INN] SIGMA DR-28 SOUND SAMPLE - YouTube](https://i.ytimg.com/vi/deNrJmLH5Zk/maxresdefault.jpg "Guitar INN] SIGMA DR-28 SOUND SAMPLE - YouTube")
Guitar INN] SIGMA DR-28 SOUND SAMPLE - YouTube
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SIGMA DR-28 acoustic guitars
1979 Sigma DR-28 DR-28H & DM-18 Guitars - Vintage CF Martin & Co Ad | eBay
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Sigma DR-28 > Guitars Acoustic | Folkway Music > Guitars Amps & More
Sigma DR-28 electro-acoustic guitar
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