1977 Hiwatt 100W Slave tubeamp. This Slave head is essentially a Hiwatt DR103 without most of the preamp circuit and no tone controls. The idea was that you could use two or more amps/stacks but only have to adjust one set of controls.
Complete serviced and working well. Condition is excellent for its age.
The serial number dates at 1977 and came out of the Kingston factory.