The Martin Authentic D-18 1937 stays true to the original with hide glue construction and historically accurate detailing. This guitar features genuine mahogany back and sides and an Adirondack spruce top, and includes an Authentic circa 1937 bracing pattern. It also includes period-correct "18" Authentic-style appointments and an Authentic neck barrel and heel. Plus, the Vintage Tone System (VTS) ages the wood to replicate the classic sound of a vintage Martin. The result is a tactile, visual and auditory experience that will transport you all the way back to the 1930s.