This Martin D-18 Authentic 1939 is just into the shop on trade! The 1939 variant of the D-18 Authentic incorporates the key features of a post-1938 "pre-war" Martin -- most notably, a rear-shifted X brace and a narrower, 1 11/16" nut width. The rear-X platform provides an arguably more balanced voice, tempering the boominess of a 1937-style guitar without sacrificing low end power and presence. This particular guitar is screamingly loud when played aggressively with a flatpick; and it exhibits the beautiful, woody sound of a broken-in guitar that's had its initial brightness played off.