Hi Shane,
I do not know if you know, but that is most likely a "ubber" rare Ref 325 with an original dial in excellent condition. The crown is not original, but that is a small detail in the larger issue of uncovering a Ref 325. Rust on the case is actually a good sign of authenticity, and I would not touch it. In view of the value of the watch I would only entrust any stabilization to an expert.
Please check your email. If you send me the case number, I will be able to check authenticity. You may also send the numbers to our esteemed Moderator. He is even in a better position do that than I.
To avoid frauds, please do not post case or movement number in the forum.