1978 RICKENBACKER 4000 BASS
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1978 Ric 4000 features: Cresting wave shaped headstock, Kluson riveted tuners with phillips head screws and black plastic bushings, plastic truss rod cover with logo and model name, 20 frets, glued in neck with skunk stripe, dot fret markers, no binding, pickguard, four pole pickup including cover and chrome surround, two black heptagonal knobs with silver tops, chrome bridge assembly including mutes, mono input jack.
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 1978 Rickenbacker serial numbers are:
| RA 16x | 1978 January |
| RB 83x | 1978 February |
| RC xxxx | 1978 March |
| RD 204x | 1978 April |
| RE 275x | 1978 May |
| RF 362x | 1978 June |
| RG 422x | 1978 July |
| RH 434x | 1978 August |
| RI xxxx | 1978 September |
| RJ 589x | 1978 October |
| RK 666x | 1978 November |
| RL 708x | 1978 December |