So I was reading through Narn I Chin Hurin (the Children of Hurin) and I picked up on something odd. Hurin gifts his son, Turin, an elvish knife, presumably from Gondolin. Turin then gives that knife (which is described as being bound in black leather and silver) to Sador and is not spoken of again.
In the Hobbit, the cache that the group findss in the troll cave contains weapons from Gondolin (Orcrist, Glamdring). If I remember correctly, the elvish knife that Bilbo finds is also described as being bound in black leather and silver.
It seems to me that Sting could very well be the knife of Turin . Ant ideas or further supporting or conflicting evidence?