A Sigma DM-5 is based on the Martin D-18 model guitar, as the “D” in the model name signifies a dreadnought body shape, which is the primary design characteristic shared between the two guitars the “M” likely indicates mahogany back and sides, further aligning it with the D-18.
Key points about the connection:
Sigma and Martin relationship: Sigma was created by C.F Martin & Co. to produce more affordable guitars, often mirroring their own designs.
Model naming convention: The “DM” in a Sigma model like “DM-5” indicates a dreadnought body shape with mahogany wood, similar to a Martin D-18.
Overall design: While there may be slight variations in construction details, the overall body shape, wood selection, and playing experience of a Sigma SDM 5 will closely resemble a Martin D-18.
A good chance to get a guitar close to a Martin without the price tag.
Nice vintage condition overall. New strings and service. See photos for detail and please ask if not sure.