The Rickenbacker 4001 is a bass guitar that was manufactured by Rickenbacker as a two-pickup "deluxe" version of their first production bass, the single-pickup model 4000. This famed design was manufactured between 1961 and 1981, when it was replaced by an updated version dubbed the Rickenbacker 4003. Variant models of the 4001 include the 4001S, 4001LH, 1999 (European model), 4001V63 (reissue), 4001CS (a limited edition series based on Chris Squire’s 1965 British model RM1999) and the 4001C64S C Series, a recreation of Paul McCartney´s left-handed 4001S with a reversed headstock. There is also a Lemmy Kilmister signature version (4004LK) of the instrument.