Amdek CMK-100 Compressor
The Amdek series of pedals was produced by Boss in the 80's as a DIY approach to pedals. They were sold as kits and generally used original Boss circuits. The PCB's came assembled and the buyer simply soldered the hardware and screwed the pedal into place.
The CMK-100 is a basic compressor that is one of the best kept secrets in the Amdek series. They're a very simple compression pedal that is perfect for subtle blues/country tones.