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- From 1970 to 2007, Sigma Guitars, a division of C.F. Martin, provided players with an affordable option in tradition and value
- Sigma Guitars were based primarily on original Martin® shapes and sizes
. The company offered acoustic guitars, along with banjos, mandolins, and other instruments.
- Martin began cutting back the Sigma line in the late 1990s and finally discontinued it in early 2007.
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