Arion SRV-1 - analog reverb pedal

This is an analog reverb pedal that uses an analog delay chip to create a reverb effect.

It's from the 1980's and predates the age of cheap digital effects. 

There are only a few pedals that use this technique to create a reverb effect in a compact pedal with analog circuitry.

It's from the classic (an underated) Arion range from the 1980s that includes the SCH-1 chorus and SAD-1 analog delay.