This is the Yamaha CR-450. This little receiver was made from 1976-1978 and was listed at $390.00. It put out 30 watts per channel and had a rated total harmonic distortion of 0.1%. It has outputs for two sets of speakers and two headphone jacks.
The CR-450 had controls for Bass and Treble as well as Low and High filter switches. It also had a variable Loudness control. The speaker selector on the front panel had settings for A, B, and A+B. There is a Mode switch for changing between stereo and mono and a Tape switch for switching between Source and Monitor.
This little guy sells for about $100-$200.