Description Product Description Here to remind you why you fell in love with Martin in the first place, the Authentics are constructed the old way - with hide glue, throughout, and historically-accurate detailing confirmed by using a CAT scan machine located at the Smithsonian Institute. Based on a 1931 D-28 in their museum, this guitar features Madagascar rosewood back and sides, an Adirondack spruce top, and authentic 1931 D-28 appointments, right down to the neck barrel and heel. Martin's new Vintage Tone System (VTS) is employed for the top and braces.