Very curiously, the centre sections of vinyl (which have been over-painted white) seem to have been a croc-skin or snake-skin pattern originally - look at the unpainted strip where the back would fit in. It may be that very early RSA Truvoice amplifiers used this vinyl, which was dropped in favour of the red/cream scheme but then revived very successfully by Selmer much later for the mid-sixties croc-skin range.
Note the trademark large pilot light, and the voltage selector for only European voltages.
