Made by Maxon in the late '80s/early '90s, this is basically several of their Master and 10 Series circuits in one box. This one was marketed as the bass version, but the only major difference vs the non-bass version is graphic EQ instead of distortion for the second block, so it works great for electric and acoustic guitar, as well. Interestingly, the chorus/flanger block has a great deal more control and range than the guitar version, more like the DCL or DCF10 standalone pedals. The delay is old school super clean digital, but can get glitchy when pushed to extremes or if you mess with it right. Has a switchable loop so you can patch in even more stuff.
Cosmetically, it has a good bit of wear, but everything works great. It can easily be powered by a standard pedalboard power supply, which is really nice.