Friedman
Used Friedman Golden Pearl Overdrive
"The Friedman Golden Pearl is a transparent, lower gain overdrive pedal designed to push already overdriven amps into seductive saturation. This versatile pedal can also be used into a clean amp to achieve that elusive semi-broken up tone. Designed to please the ultimate tone connoisseur, the responsive controls along with the three-position high-frequency cut switch, let you custom tailor the pedal to your amp. Even greater refinement is available via the tri-mode clipping voice switch, which provides LED, diode, or no clipping voice options. Built in the USA, and designed to withstand decades of abuse, the Golden Pearl is a must have pedal for any guitar player."
From what I've read, this is an approximation of a Marshall plexi-style gain circuit. It does a nice edge of breakup "loud amp" thing. Built very well, too.
This is a used pedal, but its in really good shape. Like new, no real blemishes or anything. This is a cool one, check it out!