This 0-15 was a special run of 10 instruments built by the Martin Custom Shop using Sipo, an African hardwood similar to mahogany and a close cousin of Sapele. Build specs include a mahogany top, Sipo back & sides, mahogany neck with "Modified Low Oval" profile, East Indian rosewood for the headstock, bridge & fingerboard, large old style Martin headstock logo, bone nut (1 3/4") and saddle (2 1/4" spacing), short "Diamonds and Squares" inlay pattern, and vintage style Grover tuners. Comes in the original hardshell case.