Martin Sigma GCR-7 Grand Concert 000 Acoustic Electric Guitar '74

Martin CEO-7 00 Grand Concert Acoustic Guitar Sunburst

Martin CEO-7 00 Grand Concert Acoustic Guitar Sunburst

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)

Martin Sigma GCR-7 Grand Concert 000 Acoustic Electric Guitar '74

Martin Guitar 000-17 Acoustic Guitar with Hardshell

SIGMA 41” Acoustic Guitar, Dreadnought, 4/4 Full

Sigma GCR-7 Grand Concert natural MIJ -75 serial 11724, beg

1974 Martin Sigma GCS-6 00-18 Copy Natural > Guitars Acoustic

Sigma Right-Handed Acoustic Guitars

2004 Martin 000-15S with Fishman Pickup & Hard Case