Martin Flat top Guitar Model and size

Martin guitars have a two part designation the body size a hyphen then the model located up inside the guitar on the block where the neck and body meet.

The model designations are  15, 17, 18, 21, 28, 35 and 45.

Models 15, 17, 18 post 1917 are Mahogany back and sides.  The 15 and 17 has a mahogany top. The 18 style’s top is made of spruce.

Models 21, 28, 35 and 45 are rosewood back and sides with a spruce top.

The size designation at widest point (lower bout) measurements is as follows:


Size          Width
2            12 inches
1            12 3/4 inches
0            13.5 inches
00          14 inches
000        15 inches
D           15 5/8 inches

Here is a link to my Martin Photo Gallery showing different Models and sizes.