Sigma Martin SM6S Sunburst Mandolin w/ Hard Case | Reverb Canada
Modern Sigma SM 3S Sunburst Mandolin #9208004.... Musical | Lot #82150 | Heritage Auctions
DISC Sigma SMA-6 All Solid F-Style Mandolin, Sunburst at Gear4music
FM-53S Mandolin by Sigma Guitars Valuation Report by UsedPrice.com
Sigma SM-10 Solid Top Mandolin MIJ w/Case (Used) – Acoustic Music Shop
My “at work” mandolin. Sigma SM 23. I have no excuse for not practicing. Now, can we skip ahead to the part where I am awesome, and can play every O'Carolan tune