Here to remind you why you fell in love with us in the first place, the new 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 Institution. The D-45S Authentic 1936 is based on a large body D-45 located in our museum, and features Brazilian rosewood back and sides, an Adirondack spruce top, period-correct "45" Authentic style appointments, and includes gold tuners with hand-engraved butterbean knobs. Martin’s new VINTAGE TONE SYSTEM® (VTS) is employed for the top and braces. The new Martin VINTAGE TONE SYSTEM® (VTS) uses a unique recipe that is based on the historic torrefaction system. The VTS acts much like a time machine in which Martin can target certain time periods and age the top/braces to that era. This focused method allows Martin’s craftsmen and women to recreate not only the pleasing visual aesthetics of a vintage guitar, but also reproduce the special tones previously reserved for vintage instruments.