Amdek DMK-200 Delay Machine
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 DMK-200 was the smaller brother of the DMK-100 delay. The DMK-200 features 9v operation (instead of the mains powered DMK-100) and uses the MN3205 chip that found a home in the later Boss DM-2's and DM-3's. These produced a beautiful vintage analog delay tone very typical of the early 80's.