Dating cf martin guitars
Forward-shifted, scalloped 5/16” braces on D-18, D-18E (intro. 7/17.) Scalloped 1/4″ braces 0-18, 00-18, 000-18, OMC-18E, OM-18E (intro.
7/17.) Previous Style 18: Rosewood was used for the fingerboard and bridge from 1940s until the recent return to ebony.
Not listed are seldom used Styles 25 and 37 that featured koa back and sides, and Styles 60 and 68 with maple back and sides.
Style 18 was revised in 2016 and currently has genuine Big Leaf Mahogany back and sides, Sitka spruce soundboard and bracing, ebony fingerboard and bridge, mother of pearl fingerboard dot markers, open-backed tuners, tortoise colored binding and pickguard, aging top toner, with an overall appearance reminiscent of Style 18 from the late 1930s.
Some models moved to the High Performance neck before others, starting around 2016. *No one seems to know why the 000-42 was not placed in the Vintage Series, since it had a Modified V neck.
The instrument Style is also represented by a number.
With few exceptions, the higher the style number on a Martin model, the fancier and more expensive are its materials and appointments.
Initially, the original 14-fret Martins, invented in 1929, were made in the Auditorium size only and given model stamps like OM-18, OM-28.
The stamp and model names were changed back to 000 in 1934, when Martin converted all their sizes to 14-fret orchestra models.