This is the tapestry audio fab.suisse overdrive. It's a Bluesbreaker-style overdrive, but the 3-way switch allows you to change the compression feel, making it surprisingly versatile. A unique feature is the volume control, which is a dial that clicks in steps. This, along with the knob locking mechanism, seems to be a way to prevent accidental adjustments. The clicks are quite fine, so I don't think it will be a problem in normal use. Functionality has been confirmed, unit only.