1972 RICKENBACKER 4000 BASS
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1972 Ric 4000 features: Cresting wave shaped headstock, Grover Imperial non-wavy tuners, plexiglass truss rod cover sometimes with logo and model name, dual truss rods, neck through body design with skunk stripe, 20 frets, dot fret markers, no binding, white pickguard, clear plexiglass thumb rest, four pole pickup including cover and chrome surround, two black heptagonal knobs, chrome "gaptooth" bridge including mutes, CTS potentiometers, yellow capacitor, a combination of cloth and plastic wiring, pots cavity marking, mono input jack plate, black case with blue or orange interior.
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 1972 Rickenbacker serial numbers are:
| LA 05x | 1972 January |
| LB xxx | 1972 February |
| LC xxx | 1972 March |
| LD 38x | 1972 April |
| LE 47x | 1972 May |
| LF 56x | 1972 June |
| LG 66x | 1972 July |
| LH 87x | 1972 August |
| LI xxx | 1972 September |
| LJ 121x | 1972 October |
| LK 141x | 1972 November |
| LL xxx | 1972 December |