MXR M133 Micro Amp from the early block-logo era. 1980 by the pot date. Amazing pedal that can goose the volume of your amp into some wonderful sounds. Famously used by Jack White (with a tube amp). These older models have some cool mojo.
Pedal is in very good condition with plenty of marks, scratches, and signs of use (see pics). No LED or power adaptor, uses a 9v battery. Includes the hard-to-find smaller sized knob cover, so you can adjust it on the fly with your foot. Everything works and sounds great!