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Sigma Guitars kitarat – St. Paul's Sound
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AudioPro | SIGMA GUITARS S000R-41 LIMITED | akustična kitara, omejena serija
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Kitara Sigma 000MC-1E, teräskielinen, varustettu mikrofonilla ja viritysmittarilla
SIGMA DM-1 - Kitarapaja
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Sigma kitarat testissä - YouTube
Sigma Guitars kitarat – St. Paul's Sound
