A ridiculously expensive and collect-able pedal. For the price it should be gold plated! The black goo on the circuit board is put there by the manufacturer so no one can copy its design. Scroll down to see how much it sold for. Here's the blurb from the seller.
The mighty Gold Klon Centaur #488.......comes with the 9v adapter......it's the hotness!
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Klon #488, Gold w/Centaur, Overdrive, Boost, Distortion
Item condition: Used
Ended: Feb 20, 201120:00:17 PST
Bid history: 11 bids
Winning bid: US $1,175.00