The Operation Payback event ran from April 25th to September 2nd, 2013 and rewarded community map makers with over $180,000. This pass no longer grants access to an Operation, but may be redeemed for a commemorative Operation Payback Coin.
This item is a commodity, where all the individual items are effectively identical. Individual listings aren't accessible; you can instead issue orders to buy at a specific price, with the cheapest listing getting automatically matched to the highest buy order.