Many thanks to the current owner for permission to use these pics.
The catalogues I have don’t go back far enough to show this very early, very rare Watkins Monitor combo. I can therefore only estimate its age at early 1960s. Apparently there is a picture of The Shadows using one in the early 60s. Power is provided by 4 x EL34 s. I think this makes it a 30 watt combo. That’s about all I can tell you.