MARTIN 1949 00-17

His first guitar, which he played in his coffeehouse days, was a Martin 1949 00-17. He acquired it in 1959, when he first moved to Minneapolis. He writes about this in Chronicles:

First thing I did was go trade in my electric guitar, which would have been useless for me, for a double-O Martin acoustic. The man at the store traded me even and I left carrying the guitar in its case. I would play this guitar for the next couple of years or so (p. 237).

This 'couple of years' happens to be before his official recording days, but the guitar can be heard on the Minnesota tapes and some other early tapes, including ‘Wade in the Water’, from the Minnesota Hotel Tape, which was released on Live 1961–2000. 

In 1961, Dylan gave the guitar to Kevin Krown, who was then working as his manager. When Krown died in 1992, the guitar was passed on to Peter MacKenzie, the son in the house of Mac and Eve MacKenzie, where Dylan used to play (and sleep) occasionally in his early NY days. The guitar later ended up in Paul Allen's Experience Museum Project in Seattle, where it can be seen online.
by Eyolf Østrem
relying heavily on input from
Peter Stone Brown and Paul Hostetter
http://www.dylanchords.com/professors/dylans_guitars.htm