Vintage Solartron Attenuator CR561 75 Ohms
This small scientific instrument is a Vintage Solartron Attenuator CR561 75 Ohms.
Dating to the 1950s/60s, this attenuator was made for experimental calibration of power level meters and adjustment of signal levels or anywhere where power level needs to be controlled.
It is in good used condition with a few surface scuffs/scratches, and two coaxial connectors on the rear.
Engraved on the rear: