• Sigma GCS-4 acoustic guitar
    Sigma GCS-4


Brand name: 


  • acoustic guitars

Series name: 

Dates of manufacture: 


The Sigma GCS-4 was a Marquis Series Grand Concert style acoustic made in Japan in the 1970s then in Korea (1983 to 1994) and later models were made in Taiwan or Indonesia.  The GCS-4 had a Martin style peghead. Laminated spruce top. Laminated mahogany back and sides. Rosewood fixed bridge. Adjustable truss rod. Unbound peghead and fretboard. 3-on-a-plate with open backed "economy" tuners.

Specifications (13)


Finish colorsnatural finish
Made inIndonesia, Japan, Korea, Taiwan
Number of strings6 strings


Body back materiallaminated mahogany body back
Body sides materiallaminated mahogany body sides
Body stylegrand-concert style
Body top materiallaminated spruce body top
Pickguard materialblack pickguard


Body fretNeck joins body at 14th fret
Number of frets20 fret
Tuner layoutthree-each-side


Fingerboard position markersdot fingerboard position markers


Tunersopen gear tuners

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Gallery (0)

Players (0)


Actually, your website is

Actually, your website is wrong. The first gcs4s were manufactured in or right around 1984. I have a gcs4, back brace stamped made in Korea, bought in '84, the first year of Korean production. Sigma was manufactured in Japan until 1983. A sigma manufactured in 1996 would have been manufactured in Indonesia, and a year or a few years later, sigma was discontinued. Just in recent years, a company called AMI has purchased the rights to the sigma guitar brand name and has restarted production, although they are horrible quality. Hope this helps you update your website with more accurate information, have a wonderful day.

Sigma GCS

Thanks for taking the time to correct the information, I really appreciate it & I have updated the page


Beg to differ, I agree with the article. I have a GCS-4 that is much older than yours, matching the ones made in Japan in the mid 70's, with a 5 digit serial number, made in Japan "purple" label, with the sideways M on the headstock and label, like the earliest Sigmas, but no zero fret, Figure it is made in the first three years, 1975 or so.