1981 RICKENBACKER 4005 BASS
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1981 Ric 4005 characteristics: Cresting wave shaped headstock, Kluson riveted tuners with Phillips head screws and black plastic bushings, plastic truss rod cover with logo and no model name, smaller triangle pearloid fret markers, 20 frets, glued in 5 piece neck with skunk stripe, hollow body with sound hole, binding on back, four pole neck pickup, four pole bridge pickup, white pickguard, five heptagonal shaped knobs, 3 way pickup toggle switch, CTS potentiometers, yellow capacitors, plastic wiring, additional ric-o-sound input jack, pots cavity marking, four saddle bridge, chrome bridge cover, chrome tailpiece with R logo, black case with blue interior.
The letters on the chrome input jack plate determine the year and month of production. The digits indicate the sequence of production. Some examples of 1981 Rickenbacker serial numbers are:
| UA 43x | 1981 January |
| UB xxxx | 1981 February |
| UC xxxx | 1981 March |
| UD 145x | 1981 April |
| UE xxxx | 1981 May |
| UF 206x | 1981 June |
| UG xxxx | 1981 July |
| UH 280x | 1981 August |
| UI x | 1981 September |
| UJ x | 1981 October |
| UK 407x | 1981 November |
| UL xxxx | 1981 December |