This item commemorates the 2015 ESL One Cologne CS:GO Championship.
It was dropped during the Semifinal match between Fnatic and Virtus.Pro, and autographed by Robin Rönnquist who was the most valuable player in that round.
The classic Sawed-Off deals very heavy close-range damage, but with its low accuracy, high spread and slow rate of fire, you'd better kill what you hit. It is still perfectly operational although the exterior surfaces have rusted.
Some people don't need to hide how dirty their deeds are