This somewhat familiar looking fellow uses the same DDR-era Messinstrument case that I have been using for quite awhile now. It has great retractable handles, is light and very sturdy, in all, a perfect platform for bigger devices like spring reverbs.
What makes this particular model interesting is that it includes an instrument input on the front panel. This is a typical high-impedance input gain stage for guitar, however it also allows the “dry” signal to distort when a line level signal is inserted. To keep the reverb signal clean, which it must, a dwell control was added. This allows for even more fine control of the reverb depth in combination with the HPF, high-pass filter.