The Oahu 64K and 65K models were full size Hawaiian acoustic
guitars. They had all mahogany body construction with white binding.
The 65K had a square neck and the 64K model a round neck. They came in
either natural or sunburst finishes and were made during the 1930s (the
dates of manufacture above are approximate).

http://www.youtube.com/watch?v=O4hi878z8zo