A new model for Martin in 1978, based on an arched-top 1930's Martin that had the top replaced with a flat top by Marc Silber and has been Dave Bromberg's prime instrument. Same depth as an OM but 1" wider, it works much like an OM with more bass. Versatile as both fingerstyle and flatpicker, with the cleaner bass and fast respnse that comes from the thinner body. Scalloped Braces, forward shifted, 1 11/16" nut width, Low Profile neck. This one is in supurb condition, has great power and clarity with a rich, throaty roar.