Here we have a 'green label' vintage Boss BF-2 flanger. It's got all those cool aeroplane tones on deck, and there's definitely a certain 'something' about these older examples. 

Model: Boss BF-2 Flanger
Made: Japan, Sep 1988 (serial 943410)
Type: flanger
Power: standard 9v negative supply or 9V battery (not included)
Switching: buffered bypass
Equivalent new street price (approx): n.a
Mods: none
Accessories: no box or manual
Condition notes: used, few minor marks, very good condition