CS is Custom Shop. The department of Gibson where all the historic re-issues are produced to, as close as possible, original spec. Murphy lab is a dept. within the Custom Shop that deals with the aged finishes of the guitars. Basically a few "craftsmen" that you pay a premium to duff up (age) a perfectly good guitar from the Custom Shop.I am missing a point (I am not that much into custom shops):
CS means Murphy Lab or relic in general?
Are there CS samples that are not beaten?
VOS (Vintage Original Specification) is a guitar that looks like it's been kept in a case since it's intended original year of manufacture. So a 1958 RI (re-issue) VOS is a 1958 spec. guitar that looks like it's been kept in it's case in a closet since 1958. The paintwork and metal parts may be slightly dulled, but otherwise perfect.