From around 1980 when you still knew how to make a good Amp - Crafted in Kent England - it is very close to this: Link
But not in same good shape - has apparently done som Gig's - works perfect and sound astonishing.
Missing Logo and 2 Vent Grill in the Top - I try to find some - discount if I don't succeed before sale - Speakers are x Jensen P12Q Alnico.
Label with Serial number is missing, but somebody scratch a number in the top: KKSR 13566 - maybe that's the Serial ?