Martin produced the R-series of archtops from 1932 to 1942. These guitars failed to earn much attention from players in their day, though are well-regarded by some modern collectors. The R-18 was the first entry in the R-series. Initially, the top was arched with bracing, but by 1937, the R-18 used a carved top.

Years of Production: 1932 - 1942

Wood Composition: Mahogany back and sides, Spruce top, Rosewood fingerboard

Design Elements: F-holes, dot inlays, 4-ply top binding, 14 frets (clear of body)