1981 RICKENBACKER 4001-S BASS
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1981 4001-S features include: Cresting wave shaped headstock, Kluson riveted tuners with phillips head screws, black plastic bushings and shims under the tuner plates, raised logo on plastic truss rod cover (plexiglass on left handed models), pearloid dot fret markers, glued in neck with skunk stripe, 20 frets, no binding, four pole neck pickup, four pole bridge pickup including cover and chrome surround, white pickguard, black heptagonal shaped knobs with words on silver tops, 3 way pickup toggle switch, chrome bridge assembly including mutes, mono input jack plate, black Tolex case.
The letters on the chrome input jack plate determine the year and month of production. The digits indicate the number of production. Some examples of 1981 Rickenbacker serial numbers are:
| UA 43x | 1981 January |
| UB 36x | 1981 February |
| UC xxxx | 1981 March |
| UD 145x | 1981 April |
| UE xxxx | 1981 May |
| UF 224x | 1981 June |
| UG xxxx | 1981 July |
| UH 280x | 1981 August |
| UI xxxx | 1981 September |
| UJ xxxx | 1981 October |
| UK 407x | 1981 November |
| UL xxxx | 1981 December |