This is a stunning vintage Lexicon PCM60 reverb unit.
Designed as a more accessible version of Lexicon's flagship (at the time) 224 reverb, the PCM60 delivers that desirable Lexicon reverb sound in a more manageable 1U format. These early digital reverbs do something the super-clean plugins can't - it's a great sounding box that would be at home in any studio setup!
This PCM60 is in excellent condition having been kept in a private smoke-free studio.