Martin has been making some of the best flat top acoustic guitars since the mid 1800's. Martin's other lines of instruments (electrics, archtops, mandolins) is not nearly as desirable or collectible as their flat top models. Because of this, any models other than flat tops (such as Martin's archtops and electrics) are not very collectible.
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Twelve and fourteen fret steel string models from the mid 1920's to 1944 are the most collectible of all Martin instruments. They have excellent craftsmenship, sound, and playability, and these model are of great interest to collectors and players. Some musicians prefer the sound and feel of 12 fret models, and these are close in value to 14 fret models of the same size and period. The larger size 14 fret 000 and "D" sizes from the 1930's are considered by most collectors and musicians to represent the golden era of the flat top Martin. Note war-time models (1941 to 1944) aren't quite as desirable as the 1930's models. Lack of materials, manpower, and general social uncertainty during the war contributed to this.
Flat tops from 1945 to 1969 are considered good quality and have good sound, although they are not as collectible as the 1920's to 1944 steel string models. This is largely due to the change in bracing and materials Martin started using in 1945. Rosewood models of Brazilian rosewood are most collectible from this era. This is because Brazilian rosewood was basically unavailable since 1970 due to export problems. Because of this, these models are considered more collectible.
