This amp was built in 1980 as serial #14357. It is the combo version of the Custom 50 with one 12 inch speaker.
Beside the two speaker output jacks it has also a slave output to drive more power amplifiers.
The sound is very clean and round with the integrated Fane speaker. Like all Hiwatt amps of that time it is built like a tank. The weight is about 30 kg!
Note that the sound files are recorded with the built-in speaker to give the true sound impression of the huge headroom of this amp (in comparison to the Celestion speakers in all other sound files).