1980s Sigma Martin DM12-3 Natural 12 String Acoustic Guitar | Lot #80005 | Heritage Auctions
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MIJ 1970s Sigma (Martin) DM-5 Acoustic Guitar - Evolution Music
Sigma Guitars by Martin & Co. Model TB-1 TBL acoustic guitar with case - Musical Instruments - Chesapeake City, Maryland | Facebook Marketplace | Facebook
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Any Sigma Martin fans out there? Love these guitars! DM-3M, DM-18, early/mid 1980s : r/AcousticGuitar
