Summer NAMM '14 - Martin D-18 Sycamore, 000RS25, D-28 Louvin Bros, and CS-GP-14 Tessa JeffersJuly 18, 2014VideoThe iconic acoustic brand unveils a handful of high-end creations and updated models.snamm-2014whats-newvideosgear-show-demodreadnoughtmartinacousticVideosAcoustic GuitarsNAMMAcousticReviews