This is an interesting deal. It’s for the Seymour Duncan SFX-02 Tweak Fuzz. This pedal lists for $149.00, and I’ve always seen it available for $99.95 everywhere, but recently the price has been slashed to $39.99 at Amazon. com. I’m not sure if the pedal has been discontinued or not, if you know, please let me know by commenting below. This is definitely a great fuzz for that price.
Here is the official description of the Seymour Duncan SFX-02 Tweak Fuzz:
The Seymour Duncan Tweak Fuzz? is a most unique fuzz pedal that incorporates a six position “Tweak” switch to voice your fuzz tone the way that you want it. The basic tone will be familiar to players who remember the rich, lush, vintage fuzz tones used at the big ’60s pop festivals. But with the addition of the Tweak switch, you can create a myriad of totally unique fuzz tones making this one of the most versatile pedals for electric guitar and bass. Tweak Control Engages one of six pre-set EQ resonances that give an overall “flavor” to the Tweak Fuzz, rolling off the bottom end and influencing the behavior of the gain control. Each of the six frequencies was chosen and voiced to enhance rich harmonies and bring out the most flattering qualities of your guitar or bass. Gain Control Controls the amount of square wave clipping distortion. It can go from mildly distorted to all-out fuzz fury. Volume Control Sets the overall volume to the optimum level. Whether you want to set it to match the bypassed signal or whether you want a big boost when you engage your Tweak Fuzz?: it’s your decision. True Bypass Removes the circuit from your guitar’s signal chain, allowing your guitar’s signal pass through the Tweak Fuzz? without affecting your tone or gain. Versatile The Tweak feature allows you to voice the box to your tone preference. Works with guitar or bass.
I also found this video by willievega demonstrating the fuzz: