The actual model number is of little or no importance. Sigma guitars are very nice entry level, backup or stage instruments. There is a lot of unfounded praise levied at these instruments, mostly because of their association to Martin. Most owners think they're more valuable than they truly are. Please enter the serial number below: Please enter the serial number below. These cookies allow us to carry out web analytics or other forms of audience measuring such as recognizing and counting the number of visitors and seeing how visitors move around our website. This helps us to improve the way the website works, for example, by ensuring that users are easily finding what they are looking for. Functionality Cookies.
Additional Models Approximately 1975 To 1978
Some of these guitars still had the early peghead logo, instead of the 'Second Generation Sigma' Martin style logo that started in approximately 1976.
- DT-22 Dreadnought. Spruce top. Tiger-striped maple sides and back. Maple veneer on Martin style peghead. Tortoise shell binding around back and sides. Black pickguard. Fixed bridge has diamond shape inlays. Fingerboard has snowflake and diamond shape inlays. Pearl inlay between 19th and 20th fret (inscription not described in catalog).
- DR-7S Dreadnought sunburst. Martin style peghead bound in white. Spruce top. Rosewood back and sides. Rosewood fixed bridge. Adjustable truss rod.
- DM-5S Dreadnought sunburst. Unbound Martin style peghead. Spruce top. Mahogany back and sides. Rosewood fixed bridge. Adjustable truss rod.
- GCS-4 Grand Concert. Martin style peghead bound in white. Spruce top. Mahogany back and sides. Rosewood fixed bridge. Adjustable truss rod.
- CS-4 Classical Guitar. Spruce top. Mahogany back and sides. Mahogany neck. Rosewood fingerboard and bridge.
Sigma produced numerous 'DR-*' models from the mid-70s on through 1984: DR-8; DR-9; DR-11; DR-14; DR-15; DR-28; DR-28S; SDR-28; DR-35; DR-41; and DR-45.
Colt Series 80 Dates Of Manufacture
During this period Sigma also produced a line of guitars with model numbers starting with 52S: 52SDM-5, 52SDR-7 and 52SGCS-7.52S guitars had laminate backs, and sides and solid tops.