From TF2 Wiki
The Black Rose is a knife available for the Spy. It has a seratted edge, a rose painted at the end of it, and multiple roses on the blade. There are two styles for this weapon, the normal and the Bacarra variants. This item is gained by completing the Alliance of Varient Arms achievement, "First Man Down".
- The Black rose is just a re-skin, functioning and having the same stats as the default knife.