This is an OG Boss BF-1 Flanger... oh boy! It's big and beautiful and sounds super lush. It's had a switch replaced and takes a regular 9V power supply, so it's nice and easy to work with. Infect everything in your life with some vintage flange and watch it all get better.

Model: Boss BF-1 Flanger Pedal
Made: Japan, 1977-1980
Type: flanger
Power: modified to take standard 9v negative supply (not included) or 9V battery
Switching: buffered bypass
Equivalent new street price (approx): haha
Mods: modified to take standard negative 9V supply, footswitch replaced
Accessories: no box or manual
Condition notes: used, few minor marks, very good condition