We have several of these amazing instruments, built for Gruhn Guitars with a very special mahogany and Adirondack spruce top. The Thrill of the Sinker It has long been an elusive goal to build new acoustic guitars that sound and feel equivalent to some of the finest golden era vintage instruments of the 1930s. We feel like the new Martin sinker mahogany guitars are among the closest new instruments to meet that goal we have ever seen. All Wood is not Equal While it is possible to meticulously measure vintage instruments and attempt to duplicate these specifications, it has proved to be extraordinarily difficult to duplicate the tone and feel of the vintage originals. What makes a guitar great first and foremost is design, followed by structural craftsmanship, followed by materials, and finally aesthetic beauty. While there are quite a few skilled craftsmen producing very good instruments today, endangered tropical hardwoods are in short supply and some are highly regulated and in some cases prohibited from import. In addition, even when the proper species of wood is available, very little virgin forest old-growth wood is obtainable and much of what is currently offered for sale is either not properly aged and stabilized or has been torrified (oven baked) ...