it's the 60º. his 56º wedge is the same Pro Combo sand wedge he's had for a while.
believe it or not, the one he had at the US Open was a brand new wedge that Nike hasn't even released yet from the Victory Red line of clubs. it was previously a 60º SV Tour wedge.
the reason it looks so beat up is because they take the chrome finish off so it quickly oxidizes and rusts. lots of professionals believe this gives them more spin.
Chad Campbell has all of his clubs in a raw finish.
dan
LIVESTRONG