By A Mystery Man Writer
Sigma Guitars
Sigma Guitars - Legendary Acoustic Guitars
Sigma GCR-7 Grand Concert natural MIJ -75 serial 11724, beg
Martin CEO-7 00 Grand Concert Acoustic Guitar Sunburst
Sigma Right-Handed Acoustic Guitars
Sigma Guitars - Legendary Acoustic Guitars
This one might be one of the BEST examples of this model. It is a 1974 to the best of my knowledge, due to the serial number: 74122057, on a purple
Sigma GCR-7 1974 Natural (1970-1983 Japanese era)
Sigma Acoustic Guitars
Sigma GCR-7 1974 Natural (1970-1983 Japanese era)
1970s Martin Sigma acoustic GCR-7 Japan - NO RESERVE
SIGMA Acoustic Guitars
Martin 00-21 Natural 1974 – Chicago Music Exchange