From the Price Guide

Overview

This rare Martin is much like the regular 0-18, but uses Koa for its back, sides and top. Martin used Koa in this era for a number of Ukeleles and in more limited numbers on certain guitar models. 

Years of Production: 
1918 - 1935

Product Specs

Brand
Model
  • 0-18K Koa
Finish
  • Natural
Year
  • 1934
Categories
Back Material
  • Koa