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0-18 | Standard Series | Martin Guitar
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Sold at auction Sigma for C.F. Martin & Co. DT-4 Acoustic Guitar Auction Number 3650T Lot Number 1388 | Skinner Auctioneers
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Sigma for C.F. Martin & Co SDR-41 acoustic guitar, made in Korea, ser. no. 94xxx22
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MIJ Vintage CF Martin Sigma GCS-6 Acoustic Guitar | Reverb
SIGMA DM-4S by C.F. Martin Acoustic Guitar Korea Beautiful with hard case | eBay
Sigma CF Martin CR-7 Classical Guitar (1972-78?) | Reverb
