Doh! Block logo JTM45 mkII. '65 to '67ish.
That's worth about £10,000 now....
Ouch!
I did wonder - serial number put it at March 1965
Still had all original valves etc
Single speaker jack, Bulgin socket and fuse on white rear panel
2 owners before me- last guy had it since 1969- still had a sticker on the back from Carlsboro sound where he bought it
Think I need to go and lie down