Martin D-28 / 45 Custom Conversion Acoustic Guitar (1966/2010)
.jpg "An Introduction to Sigma Guitars | guitarguitar")
An Introduction to Sigma Guitars | guitarguitar
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1979 Sigma DR-28 DR-28H & DM-18 Guitars - Vintage CF Martin & Co Ad | eBay
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RARE 1981 MARTIN SIGMA USA DR-28N D28 D-28 ACOUSTIC GUITAR grlc1841 | Reverb
.JPG?auto=compress&w=600&h=600&auto=format&q=60 "Second Hand Sigma DR-28 Dreadnought Acoustic Guitar in Natural - Andertons Music Co.")
Second Hand Sigma DR-28 Dreadnought Acoustic Guitar in Natural - Andertons Music Co.
Sigma for Martin DR-28 acoustic guitar, made in Taiwan, circa 1980, ser. no. 80xxxxx5
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Sigma DR-28 Natural Acoustic Guitar, #S40939.... Musical | Lot #81168 | Heritage Auctions
![Guitar INN] SIGMA DR-28 SOUND SAMPLE - YouTube](https://i.ytimg.com/vi/deNrJmLH5Zk/sddefault.jpg "Guitar INN] SIGMA DR-28 SOUND SAMPLE - YouTube")
Guitar INN] SIGMA DR-28 SOUND SAMPLE - YouTube
Stream Sigma DR-28 + Entwistle ET100 by Sánchez Virginia | Listen online for free on SoundCloud
