This is the sought after Boss DD-3 MIJ long chip version. It works but has issues hence selling as spares or repair. The delay sound is strangely crunchy/lofi and the delays fade in so it sounds like a reverse delay. It's a pretty charming effect. On opening it up I've noticed an amateur looking repair which might be the source of the problems. other things: the knob on the fx level control is loose so comes off. the pot is fully functional and firm. it is missing 1 screw on the bottom
eBay