In 1980, to celebrate their tenth year, Sigma guitars introduced the limited edition D-10 Anniversary model. The D-10 anniversary model combines features such as:

• Natural select solid spruce top
• Matched mahogany back and sides
• Tortoiseshell type pickguard with matching body binding
• Rosewood fingerboard with diamond and square position markers With an "Anniversary" inlay before the last fret.
• Distinctive Sigma Guitars headstock design
• Individual diecast close-ratio tuning machines

Manufacture of the Sigma DM-1 dreadnought acoustic began in 1996. The headstock has a "Sigma Guitars by Martin & Co." decal. The Sigma DM-1B is identical to the DM-1 except that it features a Solid Black Gloss Finish on the Body and Top, an Ebonized Rosewood Bridge, and White Bridge Pins

SIGMA manufactured the DM-1 ST between 1994 and 1996. The Sigma DM-1 ST features:

The Sigma DM-18 was introduced around 1978 when Sigma was the Japanese budget line of Martin guitars. The Sigma model names were chosen to match with Martin model numbers: the solid spruce topped Sigma DM-18 was closely modelled on the Martin D-18 dreadnought. Also available as a 12 string (DM12-1), the Sigma DM-18 was discontinued around 1996.

In 2011 the German AMI Musical Instruments Company bought the Sigma brand name and relaunched Sigma guitars again, including the DM-18 model, this time being produced in China.

Manufacture of the DM-2 ended in 1994.

The DM-2E/WH was introduced in 1994

Manufacture of the DM-4 ended in 1996. Some versions may have laminated tops: according to the Martin 1992 catalog the DM-4H was designed for intermediate player, has a lamintated spruce top and belongs to the "Marquis Series ".

Production of the DM-4C ended in 1996

The DM-4C/3B was introduced in 1994

The SIGMA DM-5 was a Japanese made dreadnought shaped acoustic with the following features.
Spruce top.
Mahogany back and sides.
Black and white binding.
Natowood neck.
Rosewood fingerboard.
Nickel-silver frets.
Open in-line tuning machines.
Adjustable rosewood bridge.
Adjustable truss rod through peghead from (1970 through 1979).
Unbound peghead.

SIGMA produced the DM12-1 ST between 1994 and 1996

SIGMA manufactured the DM12-4 between 1994 and 1996

SIGMA produced the DR-1 ST between 1994 and 1996. The Sigma DR-1 ST is similar to the DM-1 ST model, except it has laminated rosewood back and sides. THe DR-ST has the following features: