Nike Vr Pro X3X Grooved Un-Chromed Wedge
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There are a few wedges that are "designed" to rust. Trusy Rusty is one, Vokey Oil Can finish I believe is another...
Playing a rusty wedge shouldn't affect your game or how the ball is struck or comes off the face of the club... the rust might even give the clubface a bit more friction than it would otherwise normally have but not create a problem or rules violation or anything.
I could be wrong on the clubs I mentioned but there are some designed to rust.