Original and rare 1970-80s? Mu-Tron digital delay model 1173. Lo-Fi short delays, lots of feedback, freeze, overdrive on the input, CV modulation, 2x footswitch input, detuned delays, and it kind of gets into chorus and flange type effects; this thing is wild. Recently restored professionally, demo below. My best guess is that Mu-Tron made these for a short period of time in the late 70's right before they got acquired or went out of business or whatever. Not much info online about these, but this is the real deal. Really does sound amazing, no crackle when turning the knobs, perfect
https://www.youtube.com/watch?v=8ohetBeTvsM