Made in the short period before the Boss pedal branding came into effect, the AP-2 phaser was part of a small lineup of awesome sounding effects which included the AD-50 Double Beat Fuzz/Wah & the AG-5 Funny Cat Harmonic Mover. The serial number sticker was unfortunately removed at some point in the past. This pedal shares a lot of similarities sound wise with the AP-5 Phase 5 and the AP-7 Jet Phaser with a more basic control scheme. 

The original box is unfortunately not included but this pedal is in excellent condition, with no major wear or damage. It has been fully tested and is 100% working as it should.