I know most of the new wedges wont rust unless you get oilcans. But i found some Vokey Spin Milled 200 series wedges and they have a brushed raw steel look to them and seem like the right kind of steel to rust. I have a tour chrome C-C wedge and i know it wont rust but Ive been trying to find wedges that will rust for a long time now just for a little bit more spin than a chrome wedge.
Your best option will be the Oil Can wedge or the Black Ox (both stained finishes). The 200 Series are still a plated finish and not designed to rust. The rusting may start to appear on plated wedges if the plating is damaged in any way (with the exception of normal rust around the grooves on chrome wedges).
Mr. Vokey did make a line of raw wedges with 200 series number designations. They will have the word raw in the middle of the Vokey circular logo near the toe. Very easy to tell from the chrome version. They came before the Spin Milled.