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

This skin is available in wear conditions from 0% (Factory New) to 100% (Battle-Scarred).
The values were set by the game development.