Boss MA-1 Mascot Amplifier
The Boss MA-1 Mascot Amplifier was one of two Pocket Series products (the other being the FA-1 FET Amplifier) released in the mid 1980's. The Pocket Series were designed to clip onto the users belt using the plastic mount hook on the back. The MA-1 had a built in 2 inch speaker, allowing for 0.5 W of portable and mobile amplification.
The MA-1 can also be used as a preamp/line booster through the headphone jack. Running the headphone jack into a small tube amp can make it feel like you're adding 50w to your rig and can also add a nice thick overdrive to the tone. The MA-1 is one of the more unique sounding boxes from Boss, but has plenty of great uses.
The FA-1 and MA-1 featured a folding box, allowing stores to display them on an angle. This means an unfolded box in good condition (pictured) is even more rare than a standard Boss box.