Pictured above in a late 60’s Martin N-20. Martin is best known for their Dreadnought line of guitars, a term borrowed from ship building which denotes the full size, such as the D-28 or D-35. The N-20 is a classical guitar made for nylon strings. There is no pick guard as the strings are nylon and meant for finger picking. The N-20 was never a big seller with Martin producing less than 300 per year at the height of its popularity. The line ended production in 1992. So why would anyone even care?