What make of guitar does Willie Nelson use?

Willie Nelson is famously known for playing a guitar called "Trigger," which is a Martin N-20 nylon-string acoustic guitar. He has used this instrument since the 1960s, and it has become iconic in his performances and recordings. The guitar has a distinct sound and features a large hole, which is a result of years of wear and tear. Trigger is not only a tool for his music but also a significant part of his artistic identity.