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SIGMA GUITARS GJA-SG200 on OhGuitar.com
1974 Martin Sigma Sbg2-9 (I think) What can you tell me about this guitar? What it might be worth? I am not finding much online. I have read that they only made
SIGMA GUITARS MODEL D12-4, 12 STRING ACOUSTIC GUITAR, SERIAL NUMBER 88082411, COMES WITH HARD SHELL - Able Auctions
1990s Korean-made Sigma DM-2 Dreadnought Guitar
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SIGMA GUITARS DM 12-1 ~ 12 STRING ACOUSTIC KOREA GOOD CONDITION sn#9302000006 | eBay
Sigma DM12-5 12-String Acoustic Guitar – Ish Guitars
1980s Sigma By Martin GCS-3 Natural Acoustic Guitar Serial# | Lot #83188 | Heritage Auctions
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How To Date Your Acoustic Guitar By The Serial Number – FuelRocks
Sigma Guitars - Wikipedia
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Sigma DR2 Martin guitar | eBay
SIGMA GUITARS MODEL D12-4, 12 STRING ACOUSTIC GUITAR, SERIAL NUMBER 88082411, COMES WITH HARD SHELL - Able Auctions
Martin Guitar Serial Numbers ? When Was Your Martin Guitar Built
1990s Korean-made Sigma DM-2 Dreadnought Guitar
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Stolen Instrument: Sigma SDR-28H Korea Serial Number 91122435
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Vintage 1970s Martin Sigma DM-2 Dreadnaught Acoustic Guitar All Original w Hard Shell Case U.S.A. | Reverb