1980 Sigma DR-41 - Natural ...loaded w/Abalone! (Made in Japan) - GuitarPoint
C. F. Martin & Company - Wikipedia
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Martin, Sigma - DR7 (1971) - Dreadnought-Gitarre - Japan - - Catawiki
made By Martin) Sigma Dm-5s Dm5s Acoustic Guitar (rare Sunburst) 1970's
