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1956 Martin D21 — Mandolin Central
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1963 Martin D21 Guitar
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1969 Martin D-21 D-28 Conversion – TR Crandall Guitars
1960 Martin D-21 | Folkway
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C. F. Martin D-21 Steel String Guitar, 1967 | www.12fret.com
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Martin's New D-21 Special Limited Edition | One Man's Guitar
Martin D-21 Dreadnought Brazilian Rosewood, 1958 | www.12fret.com
